I've done quite a few, but then I've done quite a few flights!
The likelihood of experiencing one is increased somewhat if you regularly fly in/out of certain airfields. Airfields with fair weather, long runways, standard approaches and uncrowded airspace will tend to experience fewer go-arounds (in general). However, there are no hard and fast rules since life can throw you a curve-ball - we once went around at LTN because of a deer on the runway!