oot3d took me 15-16 hours at the time, so that's pretty good for a 13 year old game. the pacing is great and there is a lot to do. in terms of size, it's small. aside from the spirit temple and the shadow temple, a lot of the rooms feel tiny and closed in.
You're probably right that OoT had fewer enormous dungeon rooms than TP, but next to WW and SS?
-The Deku tree was mostly large rooms.
-Dodongo Cavern had the central area, the lizalfos fight area, and that keese flooded area where you eventually drag the rock.
-Jabu Jabu was mostly small rooms.
-Forest Temple had the giant, block-pulling room, the outdoor areas, and the jigsaw ceiling room.
-Fire Temple was almost entirely large, open areas.
-Water Temple had a variety of room sizes.
-Shadow and Spirit temples you already have covered.
Are you sure part of the problem isn't that you last replayed the game on a handheld?
oot's puzzles are all about the most basic things to do in 3d space. in 1998, this was extremely brand new, and about as far as anyone ever went with designing an action-adventure game in 3d. now, there are more complex puzzles, better aesthetics, and a larger scale.
Sure, there's a fair share of "look around in 3D space to find the switch," but there are also fake walls, water level changes, mirror-shield tricks, bombchus... I'm not going to deny that TP, for one, had better puzzles, but it's not like
all OoT did was transfer the basic format into 3D.
a lot of the forest temple's stuff is: hookshot to this thing. shoot into this eye. push block into place in the time limit. the twisty hallway is the one thing i still take away from the temple, but i don't think it stacks up to the first dungeon of tww (from what i can remember).
Fair enough, but I've played WW five times, and I can't remember a single puzzle from that first dungeon (not that this proves anything). The twisty hallway, the ice-encased eyeball, and shooting the ghost portraits are all pretty firmly lodged in my memory. Plus Phantom Ganon >>> Gohma (gorgeous as it is in Wind Waker).
First Tier: OoT = LttP
Second Tier: LA = MM = WW = TP > SS
Third Tier: LoZ = MC
Fourth Tier: OoA > AoL > OoS > ST
Fifth Tier: PH