I'm not familiar with College Baseball Insight and I'm sure it's great and well worth the price of admission for the correlated data.
However, if you're into free DIY data grinding I'd also recommend TheBaseballCube.com. For instance in you type "McLennan" in the almost hidden search box on the top right corner, you'll get a link to this page:
Not only is there a drafted players history page, there's an alumni page link that lists all active players (assuming they've been in a game), and a bunch of very cool data for D1, D2, D3, JuCo and Pro levels:
I love Fangraphs, Baseball Savant, Baseball-Reference, Baseball Almanac, but IMO Baseball Cube does the best job combining the college and pro data in one place.