Tyler, if only those conifers would die, but you give me some hope. Some idiot owner next door about 3 owners ago planted 7 cypress pencil pines about 250mm off the fence along their drive on the blind side of my place. You can imagine what they now look like, 40 feet high and 25/7 they drop their rubbish and as you say constantly fill the gutters. The people next door could only be described in the most flattering way as grubs, absolute bottom of the barrel people who would not pick a thing up unless it got to difficult for them to step over and even then they would only just move enough so the rubbish was back to being high enough for them to step over again. I believe the inside of the house is the same. Sadly in this world you are unable to pick your neighbours.
Back to the conifers I have consider poisoning them, as the trunks are up against the fence, I am replacing the fence at the moment on my side, but I figured it might be obvious even if I poisoned every second one of them