As an original s***-stirrer on this topic and heretofore confirmed middle-pather, I can only explain what drives me. I go out in full drag on the semi-regular and have for years. I do my best to appear as an ordinary woman - not an over the top drag performer. I try to blend. These activities are generally not sexual in nature but just feel right on a really deep emotional level.
I have mostly used the label of crossdresser to describe myself because it seemed like a safe identity that did not demand much of me. It does not require diagnosis by a medical professional or expensive treatments. Being TS implies an action plan that I wasn't ready to put in motion for a variety of reasons. Being a CD meant I could avoid nuking my marriage.
However, I was never comfortable in my male role. I feel like an imposter when I put on traditional menswear like any sort of professional clothing. Anything more male gendered than my jeans + tshirt uniform makes me very ill at ease. (This is not a reaction I get when I'm dolled up like an office lady.)
The middle path, such as it is, is an unstable and difficult place to be. It means not quite fitting into either camp. It is rarely an end point I think. Personally I feel a bit like an airplane in a holding pattern, trying to pick a runway before the fuel runs out.