That sounds like you are reading about running mod_php (PHP as an Apache module) rather than PHP-CGI (which is what runs here on DreamHost).
Assuming "phpmyinfo" is a script that outputs the results of the phpinfo() function, if mod_php is running that output will include an "Apache" section, and you could see the Apache modules that are installed displayed there.
This is not included in the output of phpinfo() when running PHP-CGI.
moe_rewrite is an apache module, not a php module. phpinfo() will not indicate its presence, or absence, using phpinfo() when running PHP-CGI on DreamHost, and mod_rewrite is installed on DreamHost Apaches.
If it is not working for you, sharing your .htaccess file here might enable someone to see why it is failing.
--DreamHost Tech Support