I'll use my own example here...
I turned up at the Dover game at 2:55pm (my bad), only to encounter a queue for the turnstyles stretching round Golf Road and getting on towards the Community Hall entrance.
So I got my phone out, went to the club website, bought my ticket (which immediately landed in my Gmail), flashed it to the steward on the big side gate and strolled straight in. Whole process took about 30 seconds.*
If you're on Android and/or use Google Chrome, you can auto-fill all your contact details which make the transaction a matter of seconds, I'd really start practising it if you can because it does make life so much easier.
* probably worth stressing to the club at this stage - whilst not wanting to be a grass on anyone in particular - that it was almost TOO easy - i.e. I flashed my phone for a millisecond, if people cotton on to this and the stewards are eager to get people in, people could start trying it on and flashing any old ticket. Maybe we actually need to start scanning them - or maybe we usually should be doing, and the steward had given up by that stage?