I was a 6th round draft pick out of college. I played in the SEC and played in the minor leagues for 3 years before an elbow injury ended it for me. I can say this- the difference between SEC baseball and even class A ball is world's apart. Here's why...
Consider the transition from high school to the SEC. Every player (virtually) was the stud on his high school team. As such, every SEC team is represented by a collection of high school studs.
Now consider the transition from college to the professional ranks. My teammates and I referred to it as the 'Funnel Effect.' By that, we meant that for every level of advancement from Little League on, the talent pool became smaller and smaller, separating the chaff from the wheat.
Those who say SEC baseball is comparable to AA have never been to either. In reality, there's no comparison. The talent might be comparable, but beyond that, it is consistency that makes a collegiate star into a minor league star who just might become an everyday big leaguer.
Our pitching coordinator in pro ball said, "The only difference between you guys in A ball and the Big Leaguers is consistency. Where you'll flash a great pitch, they repeat it on a consistent, routine basis."