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Did not. Drove my car. Parked in front of the stalls on the side in front of the big building. A couple of cars were clamped as they were in the middle (you'll know what I mean if you go) and there are signs saying don't park there between 09:00-16:00. No fingerprints. 2000 baht or $40 at Laos side. Friendly IOs on both sides.

Feb Update: I was in and out within 30 minutes yesterday. No demand of 2.5k for immediate return and no requirement of stay in Laos.

I had my trip today and as confirmed above, Laos forms not necessary when informing going straight back to Thailand. They wouldn't let me pay with $ and insisted on 1,900 baht. Heading back to Thailand, IO asked a couple of questions about my long stay in Thailand but I never felt I was in danger of not being allowed entry. I was not asked to prove accommodation but this might have been because I put a house address and not a hotel.

There is no request to see a flight ticket leaving Thailand in the next 30 days?