Not correcting everything everyone says all the time... Hmm... Nope not interested in doing that, it's exhausting and not a good way to keep friends.
As for as the actual time commitment, the "time-added" factor for "care" (feeding, cleaning, after the first child is pretty small (after they are ~1.5 years old.)
Regardless, the key is that I view time spent with my children as "well spent" - no matter how many of them there are. Do some programming vs dig a hole looking for frogs in the back yard with my son? Give me the shovel.
I didn't realize the value of this until I had one of my own.