As an EC member and secretary of our OC, I can't see why anyone on the EC should be upset at a resident or owner contacting them. Isn't that our job as EC members?
I'm regularly emailed or otherwise contacted by unit owners. It's not hard to redirect people to the strata manager when necessary.
Our EC members' names and unit numbers are usually listed on the noticeboards (2 buildings in complex). We also invite residents to contact us via the secretary's mailbox. From time to time we update our list of email and other contacts for residents and owners, so that we can keep people informed about what's going on.
I like PeterC's suggestion of the regularly updated information folder… though at the moment I'd be happy to ensure that EC members have something similar to help them do their job(s) properly.