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I'm not kidding when I say for the FIRST time I actually can grasp the size
(startrek.website)
A little short for a starship, isn't he?
Voyager is just a hair longer than the classic Enterprise, but it's also chonkier so it has more volume. About 150 people on an Intrepid-class, 200 on a Constitution-class.
The original ship was also packed. Many many packed bunks and crowded halls. Even as noted in DS9 time travel to TOS episode
The ship itself felt huge to me, but even Kirk's quarters were pretty modest.