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It's better than just going straight in to wash it, rubbing all the grime all over your paintwork. Don't worry about it just don't use it really close. I tend to do it about 2ft away or something.
My routine is snow foam, leave to dwell for a little while. Rinse off with PW removing as much dirt as possible without being to forceful then proceed to wash 2BM. Usually I hold the PW at an angle to the paint work and about 2 feet away. Never use full pressure but enough to do the job. Using a jetwash is much more effective than just a hose and should in theory help to keep your paint work in good condition.