When your job keeps you mentally and physically isolated from your coworkers, getting together with like minded people to talk shop is nice. Even more so because for some developers talking shop is one of the few conversation topics they feel comfortable with.
When your job is slugging away at decades old enterprise code, watching a talk about game development, fancy math, or improved development environments can be a breath of fresh air.
When your job has you at the bottom of ten layers of bureaucracy, telling people about something they should do, and having them listen and agree is wonderful.
Tech conferences are a joy.
If you aren't prepared to go to, ad get involved with, conferences, then all of the advice in this article is going to pass you by. Because it's all about establishing credibility and then leveraging it.
Maybe things are different in tech, but I don't know anyone who likes attending or speaking at conferences. Don't think of them as trips, think of them as work. Because they are.