I still do, but then again I am still in the training pipeline. Once I've popped out of the other side I am considering buying something like Navbox. However, once it clicks, it is not an onerous tool. I'l stick my neck out and state that if you make a point of using it for calculations and conversions too, you will find it a very handy device on which, in my opinion, it is harder to produce erroneous results than using a calculator.
However the clockface rule of thumb, although nearly but not quite as accurate, actually is just as effective for working out drift and G/S good enough to nav by. I am trying to find a link on Google for it, but it seems to down?? I'll edit later if somebody doesn't add it.