I like doing writing work (wordperfect) on my old machines (286-486 era). It's the one task that I find is actually better on these old machines. My Model-M keyboard is better for typing, there are less distractions and I prefer looking at a CRT when writing. It's also somewhat ceremonial booting up the machine and running WP, so that helps getting into he writing mindset.
What makes this especially convenient is that I can save files direct to a CF card and interchange it with my modern machines. CF uses the same IDE interface as a vintage hard drive, so hooking up one of these solutions with old hardware is trivially easy.