It's not just the boost, or the taste and smell, although I do miss all of those. Mostly it's the ritual in the morning, and the social experience of "grabbing a cup of coffee" with someone that leaves a big void in my life. Making my rooibos chai or having cup of herbal tea with someone is just not the same.
This condition may not ever go away, so I've sort of come to terms that coffee may have left my life for good, but before I never would have considered cutting it out completely. I didn't find that it impacted my sleep or productivity as long as I didn't drink it too late in the day.
Anecdotally, even after 7 months without caffeine, I find that I'm still much groggier in the morning than I used to be. My sleep at night hasn't improved.
Overall would not recommend ;p.