Try browning the butter if you want to bring a more nutty, noticeable, and complex flavour to the dish. It goes well with the sage, but if you want a sweeter and more subtle flavour, stop the butter from browning when it is simmering.
Another tip is to add a bit of the pasta water. It helps the sauce to the coat the pasta, and thickens the sauce, making the butter feel more like a sauce. So, save a bit of the pasta water and try it.