I know the press made a big deal about Google management not using it, but I never was worried about that. A lot of those managers are just not "public" kinda people like us, who bloviate nonstop and are constantly creating photos and stuff to share. Many of those execs can't really use social media like us because the press and Wall Street hangs on every word.
I was flummoxed why I could get more of my Facebook friends and family over to Google+. It was clearly superior in almost every way and I had every logical argument laid out. Still, not many came over. They were comfortable on Facebook and they weren't "power users" in that they didn't really see the faults that Facebook had. Facebook has fixed a lot of those faults by now, thank goodness, but I think one thing that sours most of us is how people love to use it to complain about everything.
And back on a positive note, another great thing about Google+ photos that were different/better:
1) The photos were huge and looked cleaner in the G+ interface
2) There were no advertisements
3) There were "View Counts" so you could see which ones seemed to be most popular. I still haven't figured out why Facebook doesn't show view counts.
4) It was blazing fast!