Multi part question.
1) Headed back to the US for the first time in a year and a half. Do I need anything other than my passport and my vaccine card?
2) I want to return in about a month. Lady and I will start working on marriage stuff then- do I just apply for a tourist visa?
3) When I came the application process was super painful and intricate through the website - is it the same now?
TLDR : Answer Summary
When returning to the US, US passport holders need only their passport. For those planning to return to Thailand soon and working on marriage plans, applying for a tourist visa is advisable, but visa exemption may be available if arriving before April 1st. The eVisa system remains the current method for obtaining a visa from the US.