It's also an awesome feeling when you put in a big SEO effort and see the results: your site climbing or even showing up on page 1.
Of course, there's always the flip side, when one of your sites tanks for no reason in the "Google dance" or whatever you want to call it. That can be a nail-biter for sure.
All in all, I really enjoy SEO overall. Of course there are some tedious parts (the grunt work that can be involved), but it's all in the name of the game.