Part of "doesn't get in the way" is a consistent and pleasant user interface.
Sure.
An even bigger part of "doesn't get in the way" is not crashing or grinding to a halt for seconds at a time.
It's not that part of the comment that's getting it downvoted, it's the first bit.
That's a given. If someone is putting out software that bad, I'm not even going to think of using it, so it doesn't come into consideration. Hell, I don't even know of any modern browser that bad; I have no idea where your 99% comes from. Even IE passes that test now.
I don't use a $1,700 Apple computer so that I can use poorly designed software ;-)