They don't sound the same to me.
Never have I seen ... is inversion for the sake of the pre-posed negative.
Did I ... is inversion for the sake of a question - albeit used as an exclamation.
I've heard that formula quite often with an "ever" up front:
Did I ever enjoy that!
And often without the continuation as an emphatic affirmative response to a real question.
-- Did you enjoy the concert?
-- Did I ever!!!
-- Did he eat all the cake?
-- Did he ever!!!
-- Did she finally get up the courage to tell off the boss?
-- Did she ever!!!
(The expression
And how!!! is an equivalent to
Did ... ever!!!)
CJ