I'd also like to say that old school D&D has literally got me back into the hobby. Without the OSR, I would have not have played nearly as much D&D as I have in the last 10 years. I burned out on the complexity on overly detailed rules of more modern editions and found a new inspiration in the freedom and creativity of the classic editions.
If you want to give old school gaming a spin, I highly recommend
Basic Fantasy. It is free as a pdf, well supported with free supplements and bridges the gap between a modern approach and a true classic D&D experience. I suggest take an evening to download the rules and one of the adventure anthologies, approach it with an open-mind and try it out.
I have used it with my weekly open table D&D campaign that has ran for almost 2 years. Its on hiatus now due to coronavirus and personal life changes, but I sorely miss it.
I had players who were veteran old school players, veteran modern D&D players, and brand new players and it was universally well received... I had 8-10 players every week, for a time. That game was filled with some classic old school experiences.
Some of them off the top of my head...
The fighter used nothing but a torch and several flasks of oil to kill a dozen zombies, single handed.
The Disco Room... surfaces with reflective surfaces... pillars firing laser lights. Getting struck by such can cause some interesting detrimental effects. Overcome by a clever use of a bag of flour.
The party is in combat with a massive skeletal snake... one of the players, in the middle of the fight, decides to flee through an unexplored passage. He triggers a spike pit trap and falls to his death.
Level 1 Dwarf in a party battling a pair of giant scorpions. Stays in the back ranks for most of the fight. But then decides to enter the fray. Kills one with a mighty swing of his axe, but the other gets him with its stinger. Despite being a Dwarf and having a really good poison save, he botches the roll, and dies a glorious death.
A party of 2nd and 3rd level characters, with a single magic weapon between them all, managed to defeat 4 gargoyles using the environment and clever tactics.
A fighter used his bedroll to cover the head of a monster, allowing a wounded ally to withdrawal, safely.
And the maps! My game was a megadungeon and the players had to map for themselves. To get anywhere they had to use the maps to tell me the directions. Over the course of a year and a half they have collected about 10 pages of maps filled with notes, scribbles and question marks. These maps have become a physical relic of the campaign.
Edited to add: Anyone have want any more details and also anyone have any interesting old school experiences in their games?