I've been visiting various Starbucks in our area while dressed (skirt, blouse, stuffed bra, women's sandals, etc.) for a couple of weeks and continue to be surprised at how easy it is. I wished I'd started much sooner.
People come sit next to me and talk, perhaps a little more than when I'm wearing men's clothing. Just now a fellow in his 60s moved from the other side of the store to the chair next to mine (his wife followed a little later.) I asked if he moved to enjoy the sun and we had a 10 or 20 minute conversation about computers, etc. It was no different than if I were in drab.
One difference is that the staff, if anything, is a little friendlier: they really want to make sure that I have a good experience as a crossdresser in their establishment.
Even high school kids are reasonably polite. Sometimes I've noticed them snickering a little after they leave, but not to my face.
It is nice to just dress as I like and work away on my computer in public and to be able to look up everyone once in a while to see pretty women smiling if I catch their eye