Does anyone else forget they are riding fixed after going geared for a while?

nope, if you´re constantly switching between geared bike and fixed wheel bike, it shouldn´t even have an impact.

however thought if you have been riding fixed wheel for months, even years, then it would come as a surprise.

As usual ed you've hit the nail on the head, I don't switch constantly, I use my geared when I have mechanical problems with my fixed, which usually lasts at least a week or two before I have a chance to fix/jury-rig/take to LBS... About three times in the last year, after each time, I forget I can't freewheel.

The opposite happens too, the first time in a while I go geared I forget you can freewheel, but that doesn't really cause a problem, at least not as much...

Hmmm, can't decide if I should try to use the geared on occation just to mix them up or carry on as is...

Funny thing is that my fixed is a beaten up holdsworth (frankenbike) that is almost the same age as me and my geared is a shiny silver trek racer... If I had to label one as a beater it would be the trek... I don't think anyone outside of this forum would think the same way...