Slashing is easier and quicker than push-mowing, but it still involves fuel, noise and exhaust, and is not a job I look forward to, and this year I have hit upon a more bucolic solution to the long grass problem. Cows!
Bella (at front, above) and Caramel have been roaming the paddocks all winter, but with the grass in the veggie patch becoming unmanageable, I've been putting up two-strand electric tape around the beds and letting the cows do the work. Moving the electric fences around does take time, but much less time than it takes to mow, and less time than slashing as well, if you count the changing over of the implements on the tractor. And the cows do a good job, getting right up to the fences (and occasionally the veggies if I've put the fence too close!).
Most recently, they cleaned up a manifold of 21 beds that contained brassicas that were no good anymore. By the time they had eaten all the broccoli, they were a little bored, so when I moved them into a run 100 metres by 3 metres, there was some kicking up of heels and some running hither and thither, such happy cows in the long grass!