We stayed in Sukhimvit Soi 11. Travelled by skytrain to Chatuchuk, MBK and River no problems. The military were in small numbers on Sukhimvit road around us as was rolls of razor wire. We carried on our sightseeing and shopping with no hinderance whatsoever apart from detours around protest sights. Life as normal for a tourist during our stay.
However we were there during the short period of a truce. But things look like they are heating up again. Glad i'm back home. I feel for all the people with tickets booked to travel as I know the apprehension that you are feeling.
Just stay well informed, these forums are a wealth of knowledge from people like DragonC.