I use my trolley for about 60% of my work.
I find it easier. Mine is a cheapo Maplins trolley, barrel, with a small pump and small battery on a bit of ply that sits on top held in place with velcro on the barrel and the underside of the wood.
Easy, light and very portable. From pulling up and walking off with trolley and pole in tow, less than 60 seconds.
My pole hose is about 25m with seems to give me a decent distance without having to keep moving the trolley. Over time, I've got to know exactly the best place to put the trolley on larger jobs and how much water I need.
I also only fill 25ltr barrels with about 20ltrs of water. It's makes them easy to carry.
Obviously, not ever job is suited to using a trolley but especially for my work in East London where sometimes you have no choice but to walk a few hundred metres to get to the job, there is no other way.