I want to be a plotter but I end up being a pantser. I think it's because I make my story too character-oriented and so my plot just gets derailed.
As for writers block - its a myth. It really is. You have the potential to write the next scene - but writing a story can be a daunting task and overwhelming. People will disagree with me, but I find writers block is another word for saying - you are burnt out. At least for me haha.