You could say "it was worth the wait" or "it was worth waiting for".

"be worth doing" is correct.

Actually, I think what you want to say is "it was worth waiting for . . . . " I hope that's what you mean anyway. And I hope whatever it was, was indeed worth waiting for :)

The interrogative form is "Was it worth waiting for?". The declarative form is "It was worth waiting for.".

The interrogative form is "Was it worth waiting for?". The declarative form is "It was worth waiting for.".