Well I'm not sure what happened but the issue seems to have resolved itself 
somehow:

$ ps aux | grep "dovecot/imap" | wc -l
2168
$ ps aux | grep "dovecot/imap" | grep IDLE | wc -l
56
$ ps aux | grep "imap-hibernate"
syslog    863411  0.4  0.0  16660 15296 ?        S    09:07   1:40 
dovecot/imap-hibernate [2298 connections]

Since my initial message we played with the following settings which seem 
unrelated to hibernation:

mail_debug
haproxy_trusted_networks
mmap_disable
mail_fsync
mail_nfs_index
mail_nfs_storage
mail_max_userip_connections

I'll try to provide more info if the issue arises again.
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