I've actually had caffeine help regulate my sleep at times - I figure it helps me use my energy up earlier in the day, leaving me with less difficulty getting to sleep at night.

That said, I do get a day or three of withdrawl headaches if I go cold turkey these days. I recently went through a 4-5 week abstinence - not my first - but was extremely surprised when, this time, I temporarily became a morning person for the first 3 weeks of it. That's new. Then my schedule reverted to it's normal night owl behavior - presumably after deacclimatizing from my previous caffeine intake levels.

I'm not abstaining currently, but I am trying to keep it in moderation. My main source of caffeine comes with too much sugar (in the form of energy drinks), which I'm a bit more worried about. Fewer drinks, smaller drinks (e.g. consuming half portions), healthier & decoupled substitutes (real fruit for the sugar, tea for the caffeine.)

I never acquired a taste for coffee, for better or worse.

There is widespread evidence that coffee provides nutritional benefits not found in any other plant or food. And moderate caffeine can be a sum positive effect on the body, as long as you don't go overboard. The anxiety you mention is not the norm if coffee is handled responsibly, and actually it can help stabilize anxiety over time if used consistently.

Yes, I used to be an avid coffee drinker, but I would get so irritable that my relationships would suffer so I quit. Things are much better now, and I find that I have more energy now naturally than I had before when I was a caffeine-addict.