Eeek! Good luck. I'm not in your zone, so can't make any suggestions. I can only express sympathy.

I feel for you--we have the exact same problem. How we're dealing:

a line of Cedar Green Giant
a weeping willow tree

It's not an immediate fix, which stinks. The other thing you could do is build an arbor and trellis that blocks it and grow climbing hydrangea up it (or some other large, vigorous vine--I don't know if hydrangea works in zone 5). Good luck!

Aesculus parviflora or Bottlebrush Buckeye makes a beautifully dense and attractive shrub. It spreads 10ft and reaches a max height of 10ft. It makes really pretty white plumy kind of flowers in summer and then in autumn the leaves turn yellow and orange. Very attractive plant! Oh, and it can be grown in zones 4 - 9!