My personal experience is that processing yearly extensions by reason of marriage are not that much of a hassle at all. I have done four extensions, all in Hua Hin and the only slightly annoying thing about it is the number of documents that need to be signed when you hand in the final package at the Immigration Office.
I've never really had a problem about supplying the correct documents, Hua Hin supplies a list of what they require and so long as you follow it, you won't have a problem.
The only slight problem I had was in the very first year (when I didn't have the document list from them) and I didn't have a copy of my daughter's birth certificate and had to go back home to get it and make a copy.
Subsequent years - plain sailing. I've always found the IO's very pleasant to deal with. No questioning of virtually any kind, they just take the documents, check through them, take a photo of myself and the wife and then give me a date to return to get the extension stamped in.
Incidentally, they only ever did a home visit in the first year, which was a quick ten minute drop by, which I didn't find intrusive in the slightest.