Although I have seen a couple screenshots, I haven't gotten to "play" with 6.5 yet, but I was running 6.1 via a modified ROM on my HTC 6800, and if you were to put that next to my old Phillips PDA running Win CE 2, you would immediately see the similarities.
BTW, I notice that you are running a 3Gs. What have they improved versus the latest update to the 3G? My friend and his wife are still plagued with really poor reception, and it can't be all AT&T's network, because my TracFone C139 runs an AT&T SIM (TracFone doesn't have their own network) and I don't have anywhere near the reception issues he deals with, and we live and travel within the same area.
Red BB Curve 8330m
v.4.5.138 (Platform 188.8.131.52)