The misery is definitely worth it. But I would say the misery isn't the hardest part, the long-term commitment is.
When I was going through the misery/fog/suck, whatever you want to call it, I was going on will power alone. I had psyched myself up to quit. I was fully committed. Out of the gate, nothing could stop me, and I was fully expecting it to suck.
It's when I got comfortable again that my daily promise really mattered. That's not to say that your daily promise isn't critical right now - it is. Building relationships with members in your quit group, reading everything you can from all corners of this site are among the most important things you can do to keep your mind occupied right now. But quitting is a long-term commitment. The one thing, actually the only thing all of us here have in common is that we are (are!) addicted to nicotine. We will be addicted for the rest of our lives, and will never be cured.
And your daily promise matters most when you are just cruising along, and everything is well in the world, and out of no where a crave comes up and sucker punches you right in the gut. For me it was around day 130, again around day 200, and again around 350. On those occasions, the only thing that kept me quit was the promise I had made that morning.
It sounds crazy that a promise made into the great void of the internet to people you have never met makes a difference. But is does. I don't want to let my brothers in quit down. Ever.
We make the promise every day, so it's never very far from our minds. We make the promise early in the day, before we leave the house, so that using nicotine is off the table. We collect digits from our brothers so that, in the case of an emergency, we can reach out for the support, or kick in the ass (they're pretty much the same thing) we need to keep us quit. When we collect someone else's digits, we also commit to being available to them when they reach out for help.
Drink the Kool-Aid. Jump in with both feet, and trust the system. It's been working for me for 426 days. It's been working for others for +3,000.