In other words, with Windows it's more or less possible to use every aspect of the OS without needing a keyboard, is this possible with Linux yet?
I don't think you meant to imply you want to use Linux with only a mouse, but to get away from a terminal right?
I would say an out of the box ubuntu/mint install is likely to not need terminal use for browsing the web and consuming media, but I think if you gave it a try, you may come to desire the terminal for certain things over time anyway.
Think about this: there's certain things about every OS you become accustomed to even if it isnt elegant. Windows has plenty of that... too many weird places in which settings and preferences live.
When you learn a new OS, there could be initial frustration as you find more such issues. But that doesn't mean the other OS is worse, it just means you've come to accept the madness of <insert favorite OS>
The nice thing about actions through a terminal is they may outlast the UIs, so once you learn how to do something in a terminal, it'll help you more over time.
You don't need to become a terminal expert all at once, but don't be afraid of learning, because terminals haven't disappeared for a good reason. They're a good interaction medium for certain tasks.