Getting enrolled users from upcoming sessions

I am trying to get a list of enrolled users from upcoming sessions. The trouble we are running into is that we have to start at the course level, drilling into each course to get a list of all sessions, then pare that list down to future sessions, then get enrolled users from those sessions. Rinse and repeat for every single ILT course. As you can imagine that lift is pretty heavy. Has anyone encountered this? Is there a way to get enrolled users from upcoming sessions without having to drill into each course in the system? Thank you in advance!