Ok, i will make my self bit more clear. Your first screenshot is good example: lots of boxes, few are unnecessary. You think you can go from between, but the hole is just too small and you can go from there and you have to go around them. It often starts to annoy (atleast it annoys me :p) and when you suddenly get stop between the boxes and you thought you could go between, it makes you more vulnerable. It takes your concentration away and you can get shot. so, take few boxes of for more space to strafe/jump. Keep it so you can't strafe non-stop around the map, but you still can take some speed.
For hump, rocks, ramps whatever you want to make. I mainly meant that they are there for you to pick speed and get over some clutter. They dont need to be 45° ramps, where you fly to the top of the map, just some small ones. Also if you get stuck in 1v1 situation, they come more interesting when you can avoid shots by taking a jump from a ramp or dj from a small crate.