Yes, I'm aware of those works, and maybe I shouldn't have sounded like I was making him insignificant. Certainly, the B-A-C-H Fantasy and Fugue is a 'workhorse' of the repertoire. And a few of the pieces mentioned are rather lengthy - maybe competition for Franck's "Grande Piece Symphonique".
Somehow, some composers seem to get 'pigeonholed'. Anton Bruckner was a church organist, but who ever heard of any of his organ works? He seems to have been a late-bloomer, and he had an awful time making up his mind about just how he wanted some of his symphonies to be done. There were even a couple of later 'editors' who did a bunch of revisions.