Yes, I have and it works great. I think a detox is in order if you are feeling tired, sluggish, slowed bowel movements, etc etc.
If your bowels are sluggish and your system is not getting all the nutrients it needs from your food, then I feel a detox is in order. Going on fruit and veggies for a few days is fine. I have done it. Gives your digestive system a break.. Then when you go back to eating regular, just make sure you are adding back good quality food and see how you feel.
My coach had me do just that before I started bodybuilding a few years ago. I felt fine..
Day 1 I did soft proteins and carbs... so soft protein -- basically tuna, egg whites... My soft carb was sweet potato... I would have 4 -5 meals with a protein carb combo and leafy green
Day 2 - I ate all the veggie and fruit I wanted... Drink a few protein shakes throughout the day.
Day 3 - the fruits and veggies had to be blended.... Drank smoothies every 2.5- 3 hours.. Still had a couple protein shakes
Day 4 was like day 3
Day 5 was day 2
Day 6 was day 1
But you could do a much shorter version.. As you said.. Just do fruit and veggies for a few days and that's fine too.
No, I never felt hungry because I was taking in calories. Yes, I loss weight but it wasn't for weightloss..
Good luck on whatever you decide!