I'm loving it so far. Pre 0.22 I was stuck in the "let's see how big of a rocket I can make" mindset. I had trouble getting them into orbit, not even mentioning visiting anywhere (although I did "hit" the mun a few times). So far into career mode I've done my first actual planned Hohmann transfer, and am on course for a mun slingshot to get a minmus flyby. Sure there are some things that could be tweaked and some issues here and there, but having an actual reason to visit places and accomplish things has definitely renewed my addiction.