On the Core Rendering Team we use the following query for tracking bugs needing triage. I've modified it to be all Blink components:
Component:Blink status=Unconfirmed,Untriaged -has:NextAction OR Component:Blink status=Unconfirmed,Untriaged NextAction<today OR Component:Blink has:Owner ownerlastvisit<today-30 OR component:Blink is:ownerbouncing
In URL form:
There are 1714 or so bugs on this list right now.
Instead of "-Needs-Feedback" we use "-has:NextAction" because we insist that a NextAction date be defined for every bug requiring feedback or otherwise prevented from making triage progress. This ensures bugs requiring feedback do not get lost, as has happened to us in the past with significant regressions (this approach to triage came out of a post-mortem).
Generally we use 28 days for Needs-Feedback and 7 days for "Needs-Bisect". We also put NextAction on bugs with multiple components where we are asking for feedback from another team.
A side effect of the NextAction date with the query above is that it provides a consistent way to temporarily move bugs out of the needs-triage query while ensuring they come back again if no action is taken.
Regarding assigning owners, I would prefer CC'ing people, explicitly asking a question in the comments, and adding NextAction to follow up if they do not answer.
Cheers,
Stephen.