Baseball did not benefit by moving to the Big Ten. It's easier to recruit in the Big 12, and better competition provides more opportunity to be a better team. There aren't many Big Ten opponents that excite the baseball fan base. I enjoy watching Nebraska play Big Ten competition in every sport but baseball.
Athletically, we've faltered in more sports than not since joining the Big Ten. Now, lots of factors go into that -- not just because we're in the Big Ten. You still need quality coaches and players.
I tend to think the biggest benefit from joining the Big Ten is academics. It's not instantaneous, but I expect Nebraska to become a better school for students, research, etc. Athletically, a lot of it is our own doings. We've had some rotten ADs (Moos, Eichorst, and Pederson before that in the Big 12) that haven't helped matters; heck, that may be the #1 issue.