Yes I did. I own both the expansions for Morrowind. But you have to remember that Morrowind is lot more open ended thatn KotOR. Even though you could visit the planets in KotOR in any order, you still had a linear story to follow. That is not the case for Morrowind.
I haven't played IWD.
As far as I can tell, Morrowind's story is just as linear.
Not necesarily. Sure you still had to complete a main quest, but after you completed it, you were free to explore the rest of the world.
After you defeated Malak, the only thing you could do is start a new game.
That is what I meant when I said that Morrowind was more open ended than KotOR