I think Google Now was also a huge part in getting the award too. For myself, I use it alot more often then I thought I would and I pull it up numerous times a day. Getting everything I want in one screen (reminders, scores, emails, commute, etc.) all have made daily tasks easier. Project Butter has completely spoiled me as well and there was no way I could go back to ICS, it really does make navigating the phone more enjoyable. Took longer than what we all expected to get that smoothness, but Google got it right.
