Yes, yes, yes, and probably lots of other "yes"es I can't find at the moment for the Picos, though not all have necessarily also used a Hue Dimmer. 
That last "yes" is me: I wrote an app with this exact use in mind--emulating the behavior of a Hue Dimmer on Hubitat with a cheap Pico remote-- hough there is nothing Hue- or Lutron-specific about it. (I even emulated the multi-taps that you don't natively get on Hubitat but do on Hue with a Hue Dimmer, though you have to mulit-tap a bit more slowly than Hue allows.)
To add to the above, here's what I'd say are the pros/cons of each:
- Hue Dimmer can pair directly to Hue and will work even if Hubitat is ever down (e.g., you're rebooting for an update)
- Hue Dimmer has zero entry cost besides the dimmer price; Lutron requires a Smart Bridge Pro for Caséta (I seem to remember you recently got one) or Main Repeater for higher-end systems
- Lutron Picos are cheap (ignoring the above), so if you want a lot, they'll eventually balance out in price
- Pico requires manual re-creation of same effect you'd get from Hue dimmer, so it requires thinking about what Pico driver you want (fast vs. regular) and knowledge of what commands you could send to the lights/groups to create the desired effect (on/off should be easy enough; get familiar with
startLevelChange()if you want "dim while holding"-type automations). This is not significantly different from what you'd have to do with a scene switch. I recall you asking about the ZEN27 a while back, for example. - Along the lines of the above, Hue Groups with Hubitat's native integration do not support
start/stopLevelChange, only lights. (This is part of the reason I wrote CoCoHue, which IMHO pairs nicely with the app above.) You can still just adjust the level up/down by a set amount with each press or hold. - Changes made in Hubitat via a Pico will be reflected immediately on the Hubitat device; changes made with Hue, e.g., via a dimmer, will need to wait until the next poll. This is of little consequence unless you have automations that trigger based on these states or demand that a Dashboard display the desired state ASAP.
To summarize my experience, I think it works well, comparable to a Hue Dimmer if you set it up that way. The only downside is when I want to reboot my hub for an update but also wander around my house during that time, as the Picos will not work for a few minutes then. I also find Lutron's software a pain to use to set these up, but that's with RA2. The mobile app for Caséta is less problematic.
