I can't comment on life in the Corps today, I know things have changed since I went through MCRD San Diego in '86. The Crucible looks fun, but I didn't have to do that. Of course I don't think you would have to worry about the more physical DI's anymore.
The Marines don't lead soft cushy lives. There are things that will certainly be challenging, but I can assure you this; few things you will ever do will give you the sense of accomplishment or pride in being able to claim the title of United States Marine. The experience was one of the best in my entire life! There are days when I wish I had stayed in.
What I'm certain hasn't changed is that you get out of it what you put into it. Go in with the right attitude, keep your mouth shut and react as quickly as you can to any and all direction with the best of your ability and you'll get through it. After Boot Camp expect more challenges, but you will be prepared to deal with them. Almost every challenge I face today in the professional world can be addressed with the same values and ideals which the Marine Corps instilled in me.
Semper Fidelis
Mark