Wikipedia reports a few polls and estimates, but it's sort of obvious, if you have any acquaintance with physicists and the physics literature, that neither consciousness nor Everett worlds feature in the vast majority of what goes on in the subject. The crucial idea is that "measurement", not consciousness, collapses the wavefunction... I think a majority of physicists equivocate somewhat on whether wavefunctions are physical or epistemic, another large group explicitly consider that a meaningless question, and then finally there are those who have a thought-out personal philosophy of what QM means about reality. Anyone who believes in many worlds will be in that last group... along with the Bohmians, the "noncommutative probability" believers, and dozens of other eccentric minorities.
Have a look through a month's worth of papers in the quant-ph section at arxiv to see what I'm talking about. Papers "finally explaining quantum mechanics" (or "the meaning of entanglement", etc) are common - there are several each week - and a few of them are many-worlds papers, but only a few.
Today's post, Where Philosophy Meets Science was originally published on 12 April 2008. A summary (taken from the LW wiki):
Discuss the post here (rather than in the comments to the original post).
This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. The previous post was Distinct Configurations, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.
Sequence reruns are a community-driven effort. You can participate by re-reading the sequence post, discussing it here, posting the next day's sequence reruns post, or summarizing forthcoming articles on the wiki. Go here for more details, or to have meta discussions about the Rerunning the Sequences series.