Almost the same here, but with Outlook @ work and Thunderbird @ home, both of which are happy to apply rules, show me counts in folders and keep my inbox clear for oddities.
I subscribe to a number of mailing lists, these are easy rules to create and I can fit processing into my day when it suits me.
Some things I drop unread into other folders as one-offs, if the situation repeats itself a few times I build a rule. classic JIT :)
One thing I would add - when there is a thread going on, I tend to keep the last email, and nuke the rest, unless someone has actually edited before replying (unusual).
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.