I think there are a lot of very viable options, but it doesn’t seem everyone has the availability of all the options. For one, many people would have a hard time finding part time work that offers pensions.
In a large sense the “work enough to get by” lifestyle is appealing for many, however it also mostly means that you are going to be doing that for a very long time since you are just scraping by, you aren’t saving a lot.
I currently fit the “FT + sabbaticals” option to a T. I am a contract worker in the Oil & Gas industry, so I typically work a project, then get laid off. When I am working, it’s often 60-80 hour weeks, and I’m hourly or day rate, so I’m earning a ton of extra money while I am working, and then usually working so much I can hardly spend it on travel cause I don’t like to take much time off while working.
It took a long time in my industry to get to the point I was making and saving enough to take sabbaticals. In 2017 I only worked 4.5 months out of the year for about 50 hours a week, and my net worth still grew. We took sabbaticals the other 7.5 months. Two months in Asia, 3 weeks in Baja via motorcycle, and 2 months on an 8000 mile camping trip where we camped every night but 3 (in which we stayed at a friends.
I have been back working since December 2017. I took a week off over the holidays to see family, but very very minimal time off otherwise. The good news is, working all last year my net worth grew about $140k, which would be enough to take about 2.5 years of comfortable spending off, while still breaking even. This year, if the market doesn’t drop at all, I’ll save about $180k, or enough to take approximately 3 years off to break even.
My current contract is slated to end in June 2020, but may extend another year. My income is high enough that I certainly won’t just “leave” a great job to take sabbaticals, but I’m full and ready for the contract to end whenever that happens. Worst case scenario is this job would keep going and I would be fully FIRE in around 5 years at 35. Although, with my career, I think even if I’m at a comfy FIRE income, I’ll continue to work contract jobs 2-3 months a year for an extra decade or two just for the extra padding, extra travel, maybe some fun toys (snowmobiles??) etc.