It's all subjective of course, but I could practically "feel" Google changing. Before I started my internship and still during it for the most time, Google was this incredible company that people, including me, were in awe about. All their products were so good. So technically refined, so methodical, you could really see that the people working on them were really smart, and really cared about it all.
And then it changed and became this "corporation", and nowadays it's sometimes seen as almost the opposite of what it was, working there being boring but stable. Part of that is probably just a normal consequence of the immense growth, but personally I can't shake the feeling that Google+ had a large part in it.