Well, a big difference between RF and EU is that EU can overload machines since it comes in packets. You can see these as the voltage of the cable.
For example, you can have packets of 512eu/t or 32eu/t. You can also transport RF at xxxRF/t, but these packages have no influence on the machine they are connected to.
An important thing to keep in mind is: without upgrades/transformers, you can blow up your machines, smelt your cables, etc.
RF on the other hand is a pretty consistent flow that doesn't have any impact on the machines.
In short: EU challenges the player to set up a proper electricity net, where he/she has to think about things like losses (higher voltage = lower losses), right voltages for the right machines, the correct energy buffers, etc. RF is just creation > storage > usage and for each (including the transportation) you can use pretty much whatever you want and connect it to whatever machine you want. This requires no real thinking.
This is false and has been false for at least two years now. You've described how EU used to work, but not how it works now. The way it works now is pretty much identical to RF, except not interoperable with RF.