There are three reasons to become Jewish by Orthodox conversion, as I understand it:
a. To be buried in Israel
b. To be married in Israel
c. To use the rabbinic courts in Israel
See this February 20, 2013 article: Court Accepts Reform, Conservative Conversions in Israel; Orthodox Vow...
My impression, from living more than 20 years in Salt Lake City, among the LDS, is that many are mystical in a sense. That is, they don't necessarily have daily mystical practices other than prayer and reading scriptures. They do, however, seem to think of, and be motivate by, their status. (see...