In terms of actually scheduling the classes, this should actually make things simpler and easier to look at. The 50 minute classes with 15 minutes between caused weird start times due to classes starting every 1 hour and 5 minutes (7:45, 8:50, 9:55, ...). 75 minute classes allow classes to start every 90 minutes at only the top and bottom of the hour (7:30, 9, 10:30, ...). 3 hour lab sessions also will now fit into the usual time slots instead of just being scheduled seemingly randomly.
As other people have said in the thread, it was only intro level courses and specific majors that have ever really scheduled classes on Fridays even before this change. This change is probably negative for science majors, but I can't imagine that they would make the change with no foresight into how they plan on making labs work in the new structure.