For all you new coaches out there, I agree It is a lot of work - no doubt.
But if you put in a little bit at a time, it's not bad. I started out just setting up one gameplan at a time (about 30-45 mins each day), and in 2 weeks I had all my gameplans set up. Now, after nearly one full season, I'm just tweaking them a little (blitz percentages, passing aggressiveness, etc.).
I hope some of you ignore a lot of the negativity on the boards and decide to give it a few seasons to try and build your teams. Once you set things up, it's really not too much time.