David Allen's Getting Things Done has a devoted following and a slightly intimidating reputation — contexts, next-actions, weekly reviews, the works. But strip it back and the engine is simple: get everything out of your head and into a trusted system, so your brain stops using its limited working memory as a nagging, unreliable to-do list.
That's the bit worth stealing even if you never do the full method: one place you actually trust to hold your tasks. This tool is that place — quick to dump into, simple to sort (Today / This Week / Someday), so your head can let go. Just try it: brain-dump everything you're carrying right now into it and feel how much quieter your head gets.