Slicing Cheeseake Tip!

When I was working at the restaurant my colleague told me this tip, that if you want to slice a cheesecake without it falling apart or having the cheesecake bits stick to the knife, immerse first the knife in hot or warm water. The higher temperature of the knife after warming it up somehow "melts" the cheesecake, thereby ensuring a smoother slice.

In some restos, they retrieve the knife or the slicer from a container with warm water, so this practice must have been around for quite some time. I'm not quite sure though if this is applicable in other types of cakes.