Man, I'm rethinking the BD-2. The OCD is one I'm really looking at. The other I like is the TC Electronic Spark Booster. Have you played it? It's a great color and harmonic added for clean and driven tones, and can get into low gain overdrive on it's own.
The BD-2 is a very good pedal, especially the Waza version of it, but I found that it doesn't work with as many amps as I'd like. So I haven't had one since the 90s or early 2000s. I like TC gear, but haven't played the Spark. Sounds like it might be a good thing, and similar in a way to the KokoBoost. As I said, the OCD is pretty much a classic by now, and so many session players I use and guitar gods have them on their pedalboards, there's a reason for it (though to be fair, a lot of them use Boss and other boutique pedals and like them just fine).
Maybe I need a bigger pedal board and should just get both
Everyone needs a bigger pedalboard. Then you get one, fill it up, and wind up needing an aircraft carrier!
Do you, or does anyone reading this, use an EQ pedal at all?
Yup. My H9 has an EQ algorithm that's pretty amazing, and the Koji Comp compressor (the gold pedal) also has an EQ high frequency boost built in. I've also used the Boss EQ in the past, and before that, rackmount EQs into guitar amps.
EQs don't just alter the tone balance; you have to keep in mind that they make any frequencies they boost louder, or make any frequencies they cut softer, going into other pedals and/or into the amp. This can completely change the character of your sound by pushing those altered frequencies differently from the amp's tone controls and preamp circuit.
Good examples of very well known players using EQ to alter their amplified tone are Eric Clapton, whose guitars often have a midrange boost, Brian May's treble booster, that pushes the high frequencies on his Vox amps to get them to break up earlier on the high frequency end of the spectrum, and there are many more examples.
In addition to pushing the amp differently, they alter the signal produced by your pickups, and can shape that tone a lot of ways. In fact, the famous session player Tim Pierce uses his Boss EQ on sessions as not only a typical EQ but actually as a Boost Pedal to drive an amp into distortion, by turning up the volume.
Lots of uses for an EQ. My only caveat is to find a good sounding one.