I just graduated BLC. How big of a deal is it that I was named to the Commandant's list?

Fairley big deal. Counts for promotion points as well as looks good later on in your career when getting looked at for SFC and above.

The big deal is that you were successful and you applied yourself. Both good character traits.

Congrats.

From a company commanders perspective, you've elevated your profile in a good way. You've shown me that you can be trusted with more than your peers of the same rank because you've risen to the top. That said, after the graduation it's up to you to show the CoC and CoR your not just an academic, but can produce the same quality results in everything you do.

Remember this, if it's the shit cleaning detail, take pride in having the cleanest shitters in the Army. Never complain about it. It will not go unnoticed and you won't be supervising this crap detail for long. Take care of your soldiers, always seek perfection in the most mundane details, and always follow up with people. You'll rise quickly.