The first category, "things you do even though you don't like them very much" sounds like many drug addictions.

It's not limited to drugs or even similar physical stimuli like tasty food; according to my personal experience you can get the same effect with computer games. There's games that can be plenty of fun in the beginning (while you're learning what works), but stop being so once you abstract from that to a simple set of rules by which you can (usually) win, but nevertheless stay quite addictive in the latter phase. Whenever I play Dungeon Crawl Stone Soup for more than a few hours, I inevitably end up at a point where I don't even need to verbally think about what I'm doing for 95%+ of the wall-clock time spent playing, but that doesn't make it much easier to quit.

Popular vocabulary suggests that this is a fairly common effect.