It's actually kinda strange, but I think I've found out that I wasn't as big a Bitty fan as I once thought I was. I loved her on the show, and I was a bit upset when the announcement was made about her leaving. But, now that I've actually seen all the eps with Natalie, I'm finding out that I much prefer the new character, a situation which I never expected to happen.
No offense to either Bitty or her fans (those who still prefer her in the 2nd-banana spot), but, I simply think Natalie is a better fit. She's strong, she's tough and no-non-sense when she needs to be, but she can also be quite tender and caring. She does the "tough love" bit with Adrian when it's called for, and she does it without being as grating, abrasive, or as condescending as Sharona was at times. She's not constantly barbing him about his problems, even when she doesn't fully understand them herself. She just deals with whatever needs to be dealt with at any given time. I guess I just never realized how grating Sharona could be at times, until I had someone else to compare her to.
In retrospect, though, I'm not sure that I could have fully and properly appreciated ANY of these aspects of Natalie, if there wasn't the departed Sharona first, against which to contrast them.
The Monk character has grown by leaps and bounds this half-season. Perhaps that character development can be at least partially explained by his having to face the loss of Sharona...a TREMENDOUS change in the life of someone who hates...and fears...change. So, maybe it will prove to ultimately be as big a bonus for him as I'm seeing it is for me, as a viewer since Day One. In my opinion, Sharona may have been a better fit earlier, but I am honestly finding Natalie to be a much better match for where Monk himself is these days (and, as I noted previously, he quite likely wouldn't be where he is without the loss of Sharona).
Never thought I'd say it about this particular show, but I'm seeing that change can indeed be a good thing.

Here's hoping for much more Natalie in the future! I'm not even opposed to the possibly-proposed romance angle, even though I was dead-set against any such idea between Monk and Sharona. (I always thought Sharona and Disher coulda worked, though...)