What is the reason why protons and electrons do not collide? can someone give me an intuitive picture of why electrons don't collide with protons? 

I know that electrons move in a sort of cloud, which is our 'orbital', and that they mainly behave like electromagnetic wave because of their very tiny mass. However, how comes they don't collide with the protons? I seriously didn't find a good explanation of these neither by professors I talked to nor by books, so a thousand points from me if you are able to get me into this.

Keep in mind that I am not looking for values, equations, or quantitative explanation of this, for that I have read enough, but for a picture. Think about the subatomic particles as you see them in your mind and describe their relationship.
They do collide.  But it's not like cars crashing and smashing each other up on the highway.  Their quantum mechanical wavefunctions overlap and the electrons do in face settle in with wavefunctions that are centered on the nucleus.  But the low mass of the electrons, the Heisenberg uncertainty principle (which has its greatest effect on low-mass particles), and the Pauli exclusion principle (electrons can't all pile up in the most stable quantum state)  cause the electron wavefunctions to get diffused out around the nucleus.  Instead of getting smashed up, the electrons basically surround snd embed the atomic nucleus.