I have a huge oak right next to my house and two large maples about 30
feet upwind. Maples are in the front, oak is in the back. I used to
have to clean the gutter about every month or two in spring and fall.

I bought the cheap white plastic covers that snap on and I haven't had
to clean my gutters in two years. I was very skeptical when I got
these, but I thought for a $1 each I'd try it. They were easy to
install with a ladder on my story and a half home.

The pine needles may or may not work.