Straining is only necessary for certain pumpkins, like 'Long Island Cheese' (a Cucurbita moschata cultivar that's not specifically bred for pie). True pie pumpkins, like 'Small Sugar', 'Baby Pam' or 'Pik-a-Pie', require no straining whatsoever.
I agree with Norm. I can't tell you how many times I have had to dab up the excess moisture from the top of my fresh pumpkin pies. Thank you so much.