I've been using Tailwind CSS for years, both professionally and for my own projects, and it has fundamentally changed the way I build user interfaces.
What I appreciate most isn't just the speed—it's the consistency it brings to a codebase. Keeping styles close to the markup makes components easier to understand, review and maintain, especially as projects grow.
The ecosystem, documentation, and developer experience have also been consistently excellent.
At this point, it's difficult for me to imagine starting a modern frontend project without Tailwind.