Different for goalies than players.
A player in the ECHL isn't very often a legit NHL prospect, barring a few guys. Bunting, Liljgren, Clifford all spent time int he ECHL, Verhaghe, F. Gaudreau, Weegar, Marchment are a few guys who spent time in the ECHL before jumping into the NHL recently.
Lots of goalies making the NHL have had stints in the ECHL, as playing time is more important than the leagues.
Vitek Vanecek, Scott Darling, Mike Condon, Garrett Sparkes, Peter Mrazek, Mike Hutchinson, Jack Campbell, Jordan Binnington, Casey Desmith, Cam Talbot, are just a few of the guys in the league who've played games int he ECHL over the past decade or so.