Programs tend not to contact you spontaneously. PDs in general are so busy during rank time that they simply don't have enough time to go down the list and contact everyone. My sense is that, for a program to contact you spontaneously, a PD or APD call if you are 'ranked to match' or pretty high on their list. Otherwise, they will not bother to call or email you to recruit, even if you are at a level where it is typical for an applicant to match based on previous years.
I sent generic thank you letters to my top 2/3rd programs within the week or so after the interview, including 'love letters' to 6 programs, and further contacted my top 4 programs post-interview trail.
To be transparent, these are the programs I have heard from:
a. Ranked to match: MGH, NYU, Sinai
b. Highly regarded (received call or PD email): Yale, Penn, Longwood, Stanford, Cornell, Columbia
c. More than generic email: UMass, UCSD, AECOM
d. Minimal contact (generic email): UW
e. No response (even to thank you letter): Hopkins, CHA
It depends on programs. "highly regarded, suffice to say you left a good impression, rank highly" are some of the better remarks I have heard in that gray zone.