Here's my take on every place I've been that I can think of, not including places where I've only rented (and so just used the rental area). For reference, I do not like booting up at the car (I have a small-ish car), and much prefer to find a dedicated room, or cafeteria, or a hallway bench (in that order). I prefer cubbies, but will pay for lockers too. General grading guide for me:
A+ - Nice dedicated boot room with free lockers (not sure this exists)
A - Nice dedicated boot room with cubbies
B - Nice dedicated boot room with pay lockers, or ample cafeteria or other space with cubbies
C - Cramped boot room or cafeteria space with cubbies or pay lockers, Hallway type space with lockers or cubbies; This would usually include using the regular rental office space
D - Cramped hallway or other similar space - only storage under benches or along walls
F - No space to boot up indoors anywhere (not sure this exists either)
+/- is given based on how nice I thought things were
These could be variable based on crowds... even Sugarbush's very nice boot room would be worthless if overwhelmed and crowded. And this is where I booted up - there may be better options at some places. (This is also by memory and my brain might be failing me.
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Resort/Ski Area (Grade) - Comment
Laurel Mountain (B+) - Nice dedicated boot room with plenty of space and (I think) pay lockers. Free lockers would get an "A".
Canaan Valley (C) - Hallway bench and pay lockers
Massanutten (B) - I've been able to use the members cafe area, which serves as a very convenient boot-up spot
Whitetail (B) - Ample cafeteria space and free cubbies
Liberty (C-) - Used the regular rental area and lockers
Roundtop (B) - Cafeteria space and cubbies I think? I have booted up at the car here too
Mount Snow (B) - Cafeteria space and cubbies I think? Hard to remember
Sugarbush - Main Base (A) - Nice boot room, lots of open shelves, changing rooms if desired
Sugarbush - Mt Ellen Base (C) - Cafeteria space with a tiny boot room next to it; Bags everywhere
Mad River Glen (B) - Cafeteria space and shelves, could be a C or D if it was a crowded day
Stratton (C) - Hallway space with pay lockers
Stowe (B) - Lots of cafeteria space and cubbies
Sunday River (B-) - Cafeteria space with cubbies, a bit more confined/cramped
Okemo (A) - Good boot room with shelving
Mount Sunapee (B-) - Boot room space with pay lockers, somewhat limited
Vail (D) - I rented here, but from a third party shop; We booted up either in the shop which was OK, or at the car
Aspen Mountain (A-) - Boot room with cubbies under the gondola, nice but a bit small; could easily be downgraded if busy
Aspen Highlands (C) - Main lodge room, awkward space and limited storage; Fine with a nice fireplace if it's empty
Buttermilk (D) - Hallway and under bench storage with some lockers available
Copper (B) - Nice boot room with pay lockers
Loveland (B) - Small boot room but fairly nice with changing rooms and pay lockers
Mammoth (B) - Cafeteria space with cubbies; Also booted up at the car at the Mill, one of the few places that works well (very little walking)
Snowbasin (A) - We had a dedicate PugSki cafeteria room and it was posh
Big Sky (A-) - We had semi-dedicated or dedicated cafeteria space each day
Taos (B+) - Nice boot room, with pay lockers, and limited under bench storage
The following places don't count, as they actually encompass my favorite approach when I can - staying slopeside, and booting up at home!
Blue Knob
Timberline
Alta
Snowbird - didn't stay slopeside here, but rode the bus with my boots on, so never booted up here
Whistler-Blackcomb
Squaw Valley
Alpine Meadows - didn't stay slopeside here, but rode the bus with my boots on, so never booted up here
Snowmass - didn't stay slopeside here, but rode the bus with my boots on, so never booted up here