This was years ago but I'll try my best.
Back story:
Lived in the village where the GF was raised and her family resided. Only foreigner in the village. Three people, including myself spoke English. Spent an enormous amount of time trying to understand the villagers. I failed, even after three years. Spent an enormous amount of time worried about security for the house and family. House was broken into a couple times while we were in the US. Electricity was unreliable, rampant irresponsible use of spray chemicals and burning of styrofoam. Two hour drive to the city where I was able to enjoy, to me, normalcy. Two hour drive and one hour flight to Bangkok to buy boots.
If not have been for living in an Isaan village I would likely still reside in Thailand.
To your question, I believe the simple things, those that many take for granted, conveniences, then in plain site, is what stirred the feelings. I didn't struggle to understand conversation, social interaction was normal. Dependable source of electricity, no need to travel 2 hrs to Villa Market in the event I was craving western food. The fact that I was a citizen and my family and I were equally protected under the law.
In short, I was home. Perhaps the same type of feeling or comfort SOME get when they go home to spend the holiday's with mom and dad. Everything but the immediate just fades away. No pressure, no stress. Well maybe.
I suppose I never considered Thailand as being my home just a long, long vacation and now I was home and sleeping in my own bed.