I think it does, yes. We have a 7'6" wide van which is a Swift, but built for the Dutch market and wider than similar British models at the time. Our neighbours on our storage site have the same van, but only 7'1" wide. Yesterday they came in to chat to us about some work we were doing on the van - and she immediately noticed how much more 'roomy' it seemed than their van.
We notice now, when looking round at other models (we're thinking of changing our current van)that most seem narrower - even if the difference is only a couple of inches.
I think if you buy 'wide' and use it, then any narrower vans will seem cramped, but you probably won't immediately notice much difference.