Someone once asked me why I go to all the bother of washing my salad leaf by leaf, then putting it in the spinner and spinning the water off - would it not be easier just to rinse it and give it a good shake?Bleugh. If you like crunchy salad with lots of flavour that lasts longer than ten seconds on the table you have to get the water off. Otherwise the leaves go limp. If your leaves are wet the dressing will not cling properly and your crutons will go soggy and horrible.
The only sure way to get your leaves thouroughly dry is with a centrifuge spinner. This machine spins the leaves fast, and draws all the water to the sides, where it dribbles to the bottom and collects. When you empty the bowl, it's not just the amount of water that amazes me, it's the greenfly you somehow manage to miss in the washing. They also get thrown out of the leaves.
For really good salad it's no good cutting corners. Dry your leaves properly. Use one of these.