It makes sense that the termini have more traffic than the intermediate stations, though, especially on a stub line.
Leslie station seems like it has great potential. Connections to Oriole and to NYGH would have been nice. The Oriole connection, especially, is sort of a continuing missed opportunity. If there's one area where Metrolinx might have been more aggressive, this is it. Imagine Leslie-Oriole as a single station with fare integration, shooting commuters down to Union Station: surely this would alleviate Yonge Line traffic considerably (EDIT: okay, a bunch, anyway -- oftener trains would help, too)?
If the TTC is serious about overcrowding on the Yonge Line, why do they not explore this option?