I'd go back to the office in a heartbeat provided it was an actual office. And not an "open-office" layout, that people are forced to try to concentrate with all the noise and people passing behind them constantly.

The agile treadmill (with PM's breathing down our necks) and features getting planned and delivered in 2 week-sprints, has also reduced our ability to just do something we feel needs getting done. Today you go to work to feed several layers of incompetent managers - there is no room for play, or for creativity. At least in most orgs I know.

I think innovation (or even joy of being at work) needs more than just the office, or people, or a canteen, but an environment that supports it.