Anecdotally, most folks I know use Reader every day at both home and office, but "use" G+ only to the extent that it's plugged into other Google services.

Anecdote: I post links to my blog entries to G+ in case Google gives it undue weight in search ranking. A few people click +1, and it's in the search results of the few thousand people who have my G+ account in a circle.

But that's it. Anyone I find interesting enough to follow ends up in Feedly.