Yes, you're absolutely right that some pleasure craft—wakeboard boats, actually—create quite large waves. It's because they displace quite a lot of water. It's done on purpose to make a wave for surfing.
The difference is this drawdown and long-period surge wave that large container ships create. Pleasure craft don't have the same displacement to draw water to themselves in the same way.
Yes, pleasure craft can cause erosive waves, absolutely, but they don't have that drawdown and surge wave.