When I arrived in April, had to spend about 40 Minutes in the Customs line. Since I only had carry on, this was time keeping me from a cold one.
Found a company, Fast Track:
http://www.fasttrack.in.th/index.phpGo off the plane in May, took bus to customs, and a TG was there with my name on a sign (along with a guy to carry my bags). She took to the VIP entrance and I zoomed though. In less than 5 minutes I was past all customs checkpoints and into the main arrival terminal.
Costs about 1400 baht, but if you arrive around midnight and just have carry on, I found it worth the cost.
Will use it again.
Regards,