Another anecdote for you. My female cinnamon ball python Cassandra (avatar pic) has lived in a modified tote/locker for most of her life. Very similar to a tank but I would consider it somewhere between a tank and a tub for functionality.

She was in this setup for about a year (had no room for her in my rack) and had been a very picky eater the whole time. About 3 months ago I purchased a second rack and now had room to put her in a tub.

Ever since she has been moved she has been pounding rats like never before.
I would definitely say she feels more secure/happy.