Sometimes. I do make sure no one else needs it at the time I go in though - handicapped or with children. In a large bathroom, I would choose a different stall. However, sometimes in small bathrooms they have one large handicapped stall and one VERY SMALL regular stall. If I can avoid having to straddle the toilet to close the stall door - I will. Can you believe, I'm 43 years old and have yet to have a handicapped person come in to the bathroom at the same time as me?
It always looks cleaner to me. 

So I had to get a quarter and go buy a "necessity" and there was a woman standing there, around her 50s, standing on her own two feet and started berating me up one side and down the other. Everyone standing in line was staring at me and I was so stunned by her hostility, all I could do was grab the "necessity," apologize, and duck back into the stall to finish my business. She actually had me in tears.
