I do beta-testing of GPS units for Garmin - for motorcycle applications - and they tell me that they sold a whole whack of consumer-off-the-shelf (COTS) handheld GPS units to American soldiers who went to Iraq during the most recent war, and wanted a "personal" GPS unit. So, it sounds like the COTS units do work well enough, even during a conflict.
It is correct that the US Military stopped degrading the GPS signal using selective availability (SA) back in 2000, but the only reason they made that generous gesture was because the most recent generation of satellites that they have sent up (as part of normal ongoing replacement of GPS satellites) are far more sophisticated, and the US military now has the ability to grossly degrade the "consumer" signal (meaning, signal received by non US military units) within specific areas without having to resort to SA degradation, which is global.
My take on it - as a professional pilot who often flies in conflict areas - is that GPS will probably work just as well there as it will anywhere else, as long as the Americans don't decide to deliberately degrade the signal in a specific area.
For motorcycle touring applications, I really don't think this would present a problem - the worst degradation they would need to apply for military reasons would be probably a 1 km error. In the type of places most of us ride, there are no detailed street level maps available, so we wouldn't really notice any loss of functionality. But for civilian pilots trying to shoot an instrument approach - it's no comfort to know that the signal can suddenly be deliberately degraded, with no notification to the "general public" users.