Which pack has been most influential in your game?

Not quite sure... most packs did influence my game in some way. But I recall Seasons revitalized everything. Not just because changing seasons and weather makes the worlds change, but the calendar somehow was what I needed to get back into the game. I did not even know I needed time management before I got it :) That said, also clubs from Get Together has been important, as has fame from Get Famous. I play community just as much as single households, so the club and fame aspects add a lot to my universe.