Ice is relative though. It's often so much warmer in Tahoe than elsewhere we usually go so it never seems that bad. Yes, that can melt and freeze overnight, but it's not, oh, Lake Louise in February. Usually it's not bad.
It's been too long since I've been to Heavenly. Personally I thought it was a bit chopped up and an oddly laid out mountain by the views as well as dinner at Himmel Haus by far make up for it.
For Park City, we've often stayed in the middle between PC and Canyons, and used the free and convenient bus service to move around, as well as head into downtown for dinner. It's true that you really do not need a car there. On the Canyons side, the bus stop drops you off at the Cabriolet gondola, which takes you up to the base village - another 20 steps and you're at the main gondola. No steps with ski gear - wish more places did that. We preferred the Canyon side of things, but at the time we were limited to average to challenging blues, so that area fit the bill. Would like to go back as it's such a nice relaxed trip there both from the airport and when you get there.
We're headed back to Whistler this year after a two year hiatus due to all the COVID mess, and I can't wait.