Actually, the TCH is quite spry compared to many "economy" cars. It just takes lots of right foot motion to tap into all of its acceleration potential. I'm sure Toyota designed it that way on purpose to improve MPG (accelerating faster than you really intended is just pure waste of fuel).
For those getting poor in-town mileage, my guess is that the pulse-and-glide technique isn't quite working. There's a big difference between accelerating to 40
mph then backing off into E-mode and accelerating to 43
mph and holding there with ICE on constantly. As for the A/C effect, we've run the A/C in ECO and recirc for EVERY SINGLE MILE so far, and our mileage has been pretty good (37.5 avg across 2 tanks).