To be honest, I like my job, it brings me fulfillment in my life and I don't have a lot of other sources of that (as stated no wife/kids). I'm not really interested in restricting my lifestyle now to hasten my retirement, although I'm certainly not so stupid that I don't save for retirement. I just don't bother to minmax my finances.

I find the type of travel you describe stressful. I also don't like the insecurity of part-time work. Maybe I'll feel differently later, but at age 31 that lifestyle is just not for me.