I had a similar strategy as a youth. It definitely makes for a more relaxed education (or gave me a buffer for when the homework becomes really hard and my youthful irresponsibility put me behind).
Now I've gone back to grad school (30 years later) and I also have kids (older but not completely ignorable :) and a job and a wife I am determined to keep happy, so I have to optimize for time, so I'm mostly going into lectures blind except for whatever foreshadowing "motivation" they've done, so it's a constant stream of completely new stuff, but a lot of "wow, that's cool" moments.
Now I've gone back to grad school (30 years later) and I also have kids (older but not completely ignorable :) and a job and a wife I am determined to keep happy, so I have to optimize for time, so I'm mostly going into lectures blind except for whatever foreshadowing "motivation" they've done, so it's a constant stream of completely new stuff, but a lot of "wow, that's cool" moments.