I've been doing low-carb (to varying degrees) for about 4 years now and love it.
I used to be all about potatoes, bread, pasta, milk, etc. Never big on sweets, but the complex carbs... oh yes. Once I almost hit 200lb at 17-ish I decided to cut carbs (/r/keto) and it worked wonders. I was down to about 150 (a healthy weight for my size) in about a year, but the weight loss is asymptotic. I lost like 10 pounds in my first two weeks, but it took me another 8-9 months to lose the other 40.
The first week or two are somewhat hellish for some people because you're essentially going through a withdrawal. It's nearly identical in mechanism and symptoms of a drug withdrawal. If anything, that should underline how detrimental regular excess carb intake can be. What's even worse than the normal "withdrawals," though, is when you cheat.
When I first went to college I ate an absurd amount of carbs for a rush event (aka fun/eating challenge) and literally fell asleep at the table. Then I felt like shit for the next 3 days. That was my last time cheating :)
You're absolutely right, though, after the first 1-3 weeks, your cravings stop, headaches stop, brain fog clears, you sleep amazingly, feel energized, and don't even notice the dessert menu. It's fascinating and I highly recommend it. You may hate it, you may love it. It has benefitted me in a lot of ways, and it continues to even as I somewhat elevate my carb intake in order to work out effectively.