I don't stand there with pump in hand look at the photo above, just under the jubilee clip there is a little button press that and the nozzle automatically stays on, while van mount is filling I then load my trolley containers onto van all hands free filling , very simple and effective.
Each to their own as long as your van gets filled and your happy that's all that matters.
I adjust went for and very simple solution that I'm really happy with, especially as I intend to put another vechile on the road soon, also I have a mate that fills a couple of 25 litres containers up once a fortnight or so as his is 95% trad and got a backpack just for the odd awkward window.