First off, it's not. DCM is my favorite NP. The smell isn't too bad, the BP is low, distillation goes quickly, it sinks to the bottom (nice when doing extractions). Ether is another great NP. The BP is low, distillation goes quickly, it floats to the top (nice when doing washes). Unfortunately, ether has a pungent smell that carries for some distance.
Toluene is great for dissolving aromatic compounds... plus the water solubility is low which is great for the environment (better than DCM), but unfortunately, it smells a lot worse than ether and is also a nasty toxic compound... personally I can't believe anyone is using it without the ability to distill it to reuse it or would even think about boiling it without using a condenser.