The only problem with big companies is, no matter who they are on an average large set ups are almost the same. There are some minor variations here and there. But your net experience will converge or move around the same point.

I don't know much about Google. But from whatever I've heard. The awesome projects where all this nirvana level work happens are very difficult to get into and bulk of the work is really maintaining legacy system.

Or in other words, its your usual large company. There is a possibility that the experience is marginally better. But as I said will on a average converge to any large corporate experience.