What is a Kelvinist?

kelvinist.com comes from a joke a friend of mine (Dorai Sitaram) once made.  He was trying to reproach me for arguing the position that vague sentiments about unmeasurable things were ultimately not scientific and therefore not interesting.  He quipped "Ervan, you are an unrepentant Kelvinist."  He was referring to the following quote:
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind: it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science.

Lord Kelvin, Popular Lectures and Addresses, 1894
The amazing thing is that neither of us had ever mentioned Lord Kelvin nor this quote to each other.  Nonetheless, he thought of this obscure quote, knew that I would know it, and coined the neologism on the spot to refer to it.  And, yes, it sounds like Calvinist, which suggests that I hold the view with an orthodoxy, a pun making the comment even better.  It is perhaps the cleverest joke I ever heard.

It remains an accurate description of my view of many things.