Some patients use them, and love them. In that case, I don’t try to talk them out of their pillow. But I’m not a fan of memory foam pillows, and here’s why:
A good pillow, in order give adequate proper support to the cervical spine, should provide consistent resistive support.
Is this what memory foam does? No, in fact the converse is true---it provides little to no such support. When you lie down on it, it squashes down as the weight of your head & neck contact the foam, creating an indentation which offers minimal, at best, support.