I've played the forward tees at my home course a few times. It's a good change of pace and good practice. It can also be a good confidence booster, to know that you can mentally can break through those barriers you set for yourself. I would like to do it more often, but I don't get to golf enough to make me feel like I can do much practice like that on the course.
@gbogey's reference was to tournament play, not a casual round early in the morning with 3 friends and nothing on the line. When something is on the line (either a tournament finish or money), most players mark more often, take longer to read short putts, ask other players to move their mark, etc... That adds up quickly.
I agree with you that when we are playing a $1/$1/$1 Nassau there is not a lot of excessive time wasted on putts; we miss them quickly and holing everything is not a time drain.
I decided to mix it up today after going to Golf Galaxy to try out some new irons. I struck the ball terribly but realized I was overswinging as I'm prone to do on a simulator. It got me to thinking about the LSW section about practicing at the edge of your competence. I realized that I had been practicing with very slow swings and not redefining where my edge of competence was. So today I filmed a series of swings starting with what felt like 50% then moved up a little faster and progressed to a series where I was swinging like I did on the simulator. I found that with each step up the speed ladder my swing slowly deteriorated but was still much improved over where I started even at full speed. My conclusion was that I need to start practicing at about 75%-80% in the garage if I'm going to get to the next level. Those swings we're good but seemed to be the point where more flaws started showing up on occasion. If I can't get it mastered at that speed I might need to go to 60% or so and then try back at 75-80%. In reality I would like the 75-80% to be my standard swing and not always feel like I'm going after it hard every time when I'm on the course (which is a tough habit to break for me)