I have a couple better bottles and one of them is over 10 years old. I've had no issues with it at all, although in that time I have cracked at least one glass carboy (maybe only one).
I don't use PBW but rather Oxyclean and Cascade to clean all my carboys. A long soak in either of these does not appear to have degraded the plastic over time.
FWIW, the milk crate suggestion is a very good one. While you're far less likely to crack BB than glass, I found the main benefit to be that you don't get the distortion of the plastic when you pick it up, so it doesn't suck in anything from the airlock.
Glass is sounding better all the time.
Glass has it's advantages, but I'm not sure I'd buy glass carboys again based on all the accidents I've heard about on-line. I've had no issues of my own, but the BB has worked great for me so why take an unnecessary risk.