Yes, and yes, but I still drink it.
If you get the exact same coffee it tastes a bit different decaf, but not bad. If you put a random good coffee and a random good decaf in front of me I would taste the difference between the two, but not be able to tell which was decaf on taste alone. I could tell from the caffeine hit but only if I’d not had any coffee that day 🙂
There are a few different techniques for decaffeinating coffee, some are better than others.
I drink it when I’ve had too much regular, but it still messes me up a bit. Tons of other alkaloids, some stimulant in coffee, not just caffeine.
The point is that coffee tastes lovely but some people (like me) can only take a small amount of caffeine before suffering ill effects.