About a decade ago my company was struggling financially, so I dropped my salary down to $24K. I was already FI, so it didn't feel particularly painful, especially since (pre-Obamacare) my medical/dental insurance was still being covered. I also supplemented my income by teaching spin classes for $60 per week, so gross was maybe $27K. This lasted a couple years until my company was back on solid footing and I raised my salary, though still well below what I would have made in the industry.
When my salary returned to normal, I found my spending levels jumped back up, due to lifestyle inflation (eating out, buying new toys, etc.) but I was already FI, so it didn't seem like a big deal. However in the past year I've been reducing my living expenses in anticipation of RE. My SWR will allow for higher spending levels, but I'd like to do some Roth conversions for a few years and reduce my future tax liability. If I can trade spendypants expenditures for personal time, it will be a major lifestyle improvement. Hope to see you fully FIRE'd folks on the other side soon.