I only have one snake, and I chose a large enclosure.
It's loaded with hides and things for security of course.

every night he comes out and stretches his full length and lounges around. sometimes he's draped over the fake plants, sometimes just flat on the substrate, sometimes draped through his warm-side water dish and over a half-log. he uses all four of his hides equally during the day.
Based on how he uses his whole enclosure, I'd say that the space, if furnished properly, is fully appreciated.
not to say that it's needed....

that's just my 2 cents as a noob