Abosultely a noticible difference in the last ~3rd of the travel.
Adding tokens is great for aggressive riding. How many is right for you depends on your weight, riding style, fork length etc etc. Rockshox have a table (which should come with the pikes) to say what they recommend.
I’ve added two to mine when RockShox recommend zero as an example. I do like to ride reasonably aggressivly and it helps to stop the forks smashing through the travel whilst allowing me to maintain good small bump performance with a proper sag set up.
There’s no harm in playing with it I’d say, they are extremely easy to put in or take out (30 second job, .. just deflate, unscrew air sring top cap, reinflate….). Ride it for a while with none, then add 1 and see, then add another and see….