Went from 15 MBPS on a DSL line to 1000 MBPS on fiber yesterday.
Nice.
I can finally stream video to two TVs, download game updates, and surf the internet at the same time without having to pause, buffer, and otherwise ration my bandwidth.
Just remember that you never get what they say you'll get. They always find ways to throttle your bandwidth and otherwise shortchange you. And, of course, Microsoft and other software companies are constantly using your bandwidth to provide you with updates and to spy on you. So be careful about trying to do too much stuff at once. You'll still have to ration your bandwidth, just not nearly as much as before.
I read a story once about a guy who had high-speed internet with hefty wireless routers, but he still complained about his wi-fi being slow. Turns out he had over a hundred devices using his wi-fi. Computers, television, tablets with streaming video for each adult and child, appliances, and so on. That stuff all adds up faster than one might believe.
Having said all that, though, you'll definitely enjoy the difference in the upgrade. It's like coming out into the sun for the first time after living your whole in a cave and being accustomed to only getting whatever little bits of ambient light manage to filter in.