Should you run?
We went to MK twice during our trip - first day and last day. First day, we tried to wake up Tink. Walked straight there. Someone beat us. The mom said they ran all the way. It was fun to see how excited her daughter was.
The last day, my wife DD, DSIL and DS5 ran all the way. They got there so fast the CM thought they had jumped the gun on the park opening. Unfortunately, the CM wasn't overly friendly, even went to check that the ropes were down.
The CM's attitude disappointed my wife, but my DS5 was oblivious, so it turned out great.
So, should you run? Although it sounds silly, if we had it to do over, we probably would at least walk fast. Since you only have one chance a day, and most people only visit MK once a year (or less), you hate to miss the opportunity.
Ultimately, it boils down to the importance of it to you.