I don't have experience with Huangshan, but I've taken trams in other places in China (including Huashan), and have found the experience to be more of less the same as in the US and Europe. Often the cars accomodate only four persons, and will sway about as much as a triple or quad ski chair. But even in those four-person cars I have shifted around quite a bit taking in the scenery, and haven't found the bump and sway to be excessive. At a place like Huangshan, the alternative to taking a tram is of course several hours of fairly strenuous hiking.