I did it... once.
Went to a park off-season, only two RVs in the place. The owner's son was in one and the incoming season's work campers in another.
I parked right next to the work campers.
Why?
The empty park had 5 back-in riverfront sites; I had reserved a riverfront site. The first was next to the bathroom, the second was between them and the bathroom, the third was theirs, the fourth I backed in. The fifth site was restricted to 32' or less, I was in a 38' class A.
So basically the only space I could back in to without being next to them would have put me right next to the outhouse. While there were few RVs in the park, the outhouse had a foot bridge over the little river to where the tent campers were set up, and there were at lest 5 tents over there (meant the outhouse was in use).
Of course, every other time I hit an empty park, I find a seclude spot to be alone.