Linux is not Windows. That said, you'll find it lean and fast. Your preferred browser (Firefox, Chrome, Brave, Opera, whatever) is still available. You have LibreOffice for word processing etc, and you can even install Steam. Spotify, VLC media player and various other things you may know and use will be available. Stuff like MS Office, obviously, isn't.
Just give it a go in live mode. You can 'burn' the image to a USB using
Etcher, and simply boot from the stick and see how you find it. It'll run in RAM and after reboot you'll be back to your usual Windows install. Note that Linux isn't a single OS, it's made up of dozens of 'distributions' which have varying user interfaces and quirks. For a Windows-like experience try Cinnamon or KDE. If you've used a Mac before or don't mind trying something new, Gnome is nice when done right, especially v40.