I took the same plunge this week. I partitioned 125 GB to Windows and the remaining 350GB to Debian 12. I was making do w/ a 240 GB SSD previously so it's overkill, but I like the idea of disincentivizing my W11 usage by limiting the space available.
For me, there's still some workflows that need to be optimized in Debian, but overall I'm slowly transitioning towards it as my main driver.