Lake downwinding better than ocean?

We did a downwinder on Cayuga Lake today. Wind was 5-15 mph. Glides were easy and easy to keep going. Easier to glide and keep the glide going, than when in the ocean, I think. Even with wind only about 5 mph, gliding was easy. I think the lack of ground swell running under you, like it does in the ocean, makes it easier to keep the glide going. Ground swell can sometimes being a nuisance, knocking you off a glide. I'd love to downwind on a lake in 25-30. It must be sick.