It's done over here too although up till recently I had only seen loop in done at the rosettes. Our 1975 bungalow has the loop in at the switches but done using single core cables, the neutral is simply a single core going from rosette to rosette. My daughters new build has the loop in done at the switches but with T+E so a neutral is present.
The only thing I find about the system used at my daughters is the back boxes seem packed with cabling particularly one where she has two switches on one plate and one of the switches is part of a two switching arrangement the back box is absolutely rammed.
Richard