Anyone bothering to try and determine whether this is true or not needs to know your definition of "regular."
I would, for the purpose of that particular comment, cede the definition to shminux and outright declare that the claim he is making about "regulars", whoever they may be, is wrong. He has confused endorsement of the QM sequence and rejection of Single World theories in general with the separate issue of agreement that it was as necessary to applied rationality as Eliezer said.
Come to think of it I don't offhand recall anyone or anything ever having expressed such agreement. "Many" and "regulars" only become relevant in as much as I am more likely to have seen and paid attention to such claims if they existed and can thereby be more confident that shminux is simply making a false claim.
Today's post, Living in Many Worlds was originally published on 05 June 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 Why Quantum?, 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.