I haven't had that kind of success, but I set up my draft lists with an eye towards possible successful DitRs, and every few seasons I get a DitR for someone I drafted for that purpose, and maybe half of those become significant major leaguers (no stars like tlowster, though).
Placido Alvarez was my second round pick in an abysmal draft. Swingman with an ERA about half a run better than park adjusted league average through 420 career innings.
Reid Jenkins, perfectly fungible second catcher from the 5th round.
Pablo Odor, 8th rounder with an SLG of .500 in his first 750 ML ABs.
I've had other, somewhat better guys, but these are the only intentionally developed DitR's on my 4 current ML rosters.