The Trouble With Knotty Pine:
Is not that it is dark, in and of itself.
The trouble is midcentury wood finishes used on it, which were browny-orange when new, and which darkened with time and UV exposure. The era's heavy cigarette habit didn't help.
If knotty pine is stripped and refinished with today's finishes which are less prone to darkening, it has a very agreeable tone similar to birch.
Even in knotty pine's heyday, there were those who did not like the dark orange-y color. My mother designed the kitchen she wanted after our house burned in January of '59. Knotty pine was the must-have of the moment, but Mom wanted no part of the usual color. She had the cabinets built (it was a time when cabinets were built on-site), and then stained and finished them herself. What she used was a dark walnut stain, and it was very attractive. It also held up better stylistically in the fifteen years after it was built; orange-y knotty pine was looking pretty damn dated by the early '70s. The walls were a light daffodil yellow, counters were turquoise confetti-patterned Formica, and the floor was Armstrong Excelon tile in white with grey and black spatters. So, there was a lot of light and bright color to offset any feeling of gloom from the dark cabinetry.
So - lighter. Or darker. But not the color you usually saw back in the day.