Really? Well, let's go with the real "Reaganomics", the policies that Reagan himself set up, and Bush Sr. followed. It's been apparent throughout history that economic changes take a few years to have their main influence. After Reagan left, and even after Bush Sr. left, the economy did great. Wonderful. Granted, part of that should be credited to the "dot com boom", but a large part should also be credited to Reagan and his policies. Clinton, on the other hand, reversed Reagan's policies, and what was happening by the end of Clinton's term? That's right, a major recession. A recession that Bush Jr. inherited, and, of course, was blamed for, when Bush had nothing to do with it. The nation thrived because of the economic changes that Reagan made, and sufferred because of the economic changes that Clinton made. Looks like "Reaganomics" works pretty well.
I guess it's just coincidence that Clinton's changes took almost 9 years to have an adverse affect - after he was out of office for nearly a year. Economic changes, especially with such enormous changes of policy, typically happen much sooner than that.

Anyway, the first time what is now known as "Reaganomics" was put into use in the early 1920s by the first of three Republican presidents...anybody remember what happened in 1929?
Of course, the Great Depression was not caused solely by Reaganomics, but also a severe influx of credit and stock-marketing with little to no regulations...who completely revamped our economic policies which allowed us to climb out of that? Oh yeah, FDR, a Democrat.