What are the experiences and challenges of going through immigration at Don Mueang Airport?

Who knows? It could have been delayed flights from other airports. At least a third of the booths were unmanned but there were so many people you couldn't see them all and signage was blocked because of our numbers. Plus lines are undefined so you never knew who was in front of who. Understaffed without a doubt. My biggest fear was that the duty free alcohol from departure points would start being consumed and things would turn violent, the potential was there. Anger was lurking all about among tired overnight travelers who wanted only a place to sleep. I feel there was danger in that situation , things could have gone very wrong . Really it could have become a police/security matter very quickly.

Yes, two events. I arrived at 03:30. It took me until 06:10 to get stamped into Thailand at immigration. I then had to locate my baggage which had been on a carousel for hours and then dash to the airline ticket counter and get a boarding pass. Then I had to clear airport security again and dash to my gate to catch a 06:50 flight.......making any sense now?

I had just arrived from Jaipur, India.

Awww could have been worse I guess but hope no one else has to deal with it. There were some really angry people in that crowd.

Yes, think I left it on the airline counter, it was a hectic stressful time trying to catch that plane. They closed the door behind me, it was so close. Contacted the airline upon landing but no luck getting it returned so far.