For people who are put off by ceremony and do not find long periods of sitting meditation (40 minutes or more) particularly useful, check out the Rinzai school of Zen. Shorter periods of sitting meditation, more emphasis on thinking critically about koans and "dharma combat" -- critical discussion. Rinzai abhorred ritual and ceremony for its own sake, so less emphasis on that.
(That is a serious question!)
I'm myself a Zen Buddhist, I train with a teacher and have spend time zen training in a zen temple and attend sesshins regularly. I'm also very secular and atheist person who don't like organized religion. It's miracle that I can coexist with religious setting, but I do it because I see Buddhsit Zen teachers as experienced coaches and temple as training facility. I also know that he is not going to indoctrinate me for anything superstitions despite his own beliefs that are different from mine (there are number of rotten zen teachers though).
If I were to describe what zazen meditation[1] is using as scientific terms as possible, I would say that it's developing and directing your attention towards higher temporal resolution and developing the ability of keeping it there (always below 1s and it can go as low as ~40 Hz). You can put your poet hat on and call it "living in this moment", "looking at the reality", "awakening to reality", "seeing the world as it really is", "impermanence" or "looking into yourself/mind", but that's what it really is in my opinion. You can't have complex philosophical toughs in such a short time. You can only see 'thoughtlets' (small incomplete toughs) forming and fading away in fractions of second. It's like using low level debugger into the functioning of yor mind (debugger being directed attention).
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[1] Same thing with most other awareness style Buddhist meditation traditions. You learn to see similarities with other traditions when you practice. Zazen is often more spartan and simplified and vital (not for everyone).
Nice description of the differences between Zen and Vipassana styles by Shinzen Young http://www.youtube.com/watch?v=7WiM-w5qqmE
Why should I be doing zen or any other form of meditation?
In my own words you should meditate because with practice one builds a refuge within stillness. Knowledge of this refuge changes the way you feel about circumstances and mental phenomena (motion). The change just feels right, like a lessening of burden, but it takes practice, that's the thing. The rituals and calligraphy are not the thing.
I eventually discovered a way to approach this state without drugs, it has to do with studying the Buddha Dhamma and practicing based on the teachings preserved in the Pali cannon, safeguarded by the Theravada lineage.
http://www.accesstoinsight.org/tipitaka/dn/dn.22.0.than.html ^ if you ctrl-f and search this text for the string "And what is right mindfulness?" then you will be onto something.
I realize that the description above may sound too general, or even like I'm describing a panacea, and perhaps I am, that's the thing.
I ditch all the rituals. You can get a lot from just sitting in a chair and meditating.
Its fantastic that it works for you. For me, This is exactly why I couldn't handle Zen. It feels too much like the hierarchical church patriarchy.
Due to this I've gravitated towards the Pragmatic Dharma crowd which tends to be a mix of Theravada and Advaita practices (though rejecting Advaita view).
Some resources for the looks-like-religion allergic:
http://kennethfolkdharma.com/quick-start-guide/ http://www.dharmaoverground.org http://awakenetwork.org
I think the author was that Osho guy...
the smart thing about buddha is he kept the discourse always on the root ("dukkha" , look it up). It's very easy to loose one's way, which osho did, if you see his life's progression.
The point is this. You can say that practice is Zen but in that perspective everything is Zen because everything is practice.
Many Zen practitioners have received their first contact with zen trough Alan Watts. He was really good writer. But eventually you must realize that he was philosopher, alcoholic and religions scholar who looked Zen from the outside. Talking and thinking about Zen is like talking and thinking about physical exercise. Philosophical thinking about koan is like treating bench press as a philosophical problem. You can't lift it with your toughs.