I have never felt that a motorbike/car was an option for me in Thailand for some reason. Just seems like it has too many issues/hassles for me to want to deal with. I'm already doing 90 day reports, dealing with flaky landlords, etc, one more hassle becomes bigger then it looks.
Glad I don't have to deal with that kind of stuff when I move, just get up and go. That leaves inner city living and walking a lot, which I'm still comfortable with.
I have always felt my living situation was unstable at best here (even on an an annual lease). That's a big factor. If I bought a residence things would be different because I'm dug in. I would have the parking spot, stable address for registration, etc.
I do miss driving very much and enjoy it whenever I return to the Usa.