yes there is but it is usually to the right of the massive crowds and so hard to get to it. I turn left and walk down to exit 3 where there is almost nobody.
When u get to the big mass of people at immigration look to your left and walk 150 meters down to Exit 3. It is signposted Fast Track but most people don't go all the way down there. I flew in Bus Class on Emirates walked down to exiit 3 and walked thru fast track in 5 minutes there is hardly anyone there
You can apply for a 12 month extension of that Visa so you do not have to get a new Visa again. Costs 1900 baht. Come and go as much as you want with a multiple re entry permit.