The feeling of planing/blasting can only be shared with others that have experience it.
I remember back when I started (although I had been planing a few times), went out on my own in what I thought was very little wind. The wind was just enough to get me on the plane without pumping, and once the sail was locked in - consistent enough to keep me there. I decided to do one long run across the bay and back (10km roundtrip) on my big 165lt board and 7.5m cammed sail. It was a perfect run, simply put as mentioned above - "Freedom".
After the first run, I dropped into the water to cool off and was so stoked, I decided to do another run...same again. The sail was sitting just right, harness lines balanced, barely a ripple on the water and I wouldn't describe it as 'blasting', it was more of a cruise. I finished the 2nd run and couldn't leave it so had to do it again, so headed out for the 3rd run.
I got 90% of the way across and started to cramp, so turned and headed back. By the time I got within a couple hundred metres off the beach, both legs were shaking and I could barely hold my own weight. I made it back to the shallows, stepped off my board and collapsed in the water with a silly grin on my face. I lay there in the water for about 20mins just looking up at the sky. That day would have to be in my top 5 of my favorite 'planing'/windsurfing memories.
With the trees outside shaking and the white-caps I can see from my office window - I can see an extended lunch break (sail) happening in about an hour.