I'm the same way with writing things I'm reading, but it's more an enforcement of reading for me.
For instance, if I need to memorize a list of terms and their definitions, hearing them will help me exactly 0 percent. Reading them will help me half way. But reading and writing them, I will have no worries.
I'm assuming it's a learning style, and probably a fairly common one.
As far as motivation, the absolute ONLY way I can get motivated for serious study is to do it at the very last minute. I'm talking no earlier than the night before, regardless of the project (within reason). The stress focuses me. "Cramming" might be looked down upon, but honestly, with the way I am, it has never let me down. I usually retain more within a compressed period of time and repetition, than an uncompressed, drawn-out period of time with the same repetition.
For me, the choice is obvious.
Now, whether I retain it for longer is another question... I'd say focus on the goal you wish to achieve.
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