Yes, it can be a bit of extra photocopies etc, but once you have all the documents its basically a couple of hours once a year. Most of the documents, including photos, map, passport etc, I resubmit each year,
I usually fire up the printer the night before and do copies,. I start the day at the ampher for kor ror 2, then go to the bank, then get to immigration mid morning, and usually done by lunch (there is never a queue at the marriage desk)
No agent fees, no 800k in bank before/after etc (a simple 400k 2 months prior, held in foreign currency), I can work if I choose to, possible path to PR.