You'll still get the "air pressure." The high pressure water isn't bad for the paint, it's the dirt that gets pushed around with such force that it'll swirl the paint.

I'm pretty fanatical with paint care. I only wash with a lambs wool mit. I wash them every 2 times I use it, then usually toss it by the 6th use.

Civic has had it's new paintjob for a year and there's not a single swirl in it.