Oh no, you had to go and trigger my Special Interest, didn't you? This is going to be a very difficult post for me and I will try to control myself.
I started D&D at 12 and never quit. I took to this game like a duck to water. I could use my foreign accents! I could keep my eyes averted and look down at the stats and sheets! I could indulge my ability to relentlessly memorize every obscure fact about the game and it was USEFUL! I DM exclusively, probably because I am a control freak. I still play, even today with a regular every-other-Sunday session. But you have questions. I'll try to stay focused on them or I'll write another mini-novella.
How much has it changed?
OMG, dude, GOOD question. A FRIGGIN TON, man. A friggin ton. I started during the Basic D&D "Blue Book" set (which is where it really started, not counting the stuff from the 70's where it was basically a collection of pamphlets and ideas). AC was completely different having only 1 thru 9 rather than the +/-10 we have today. Also, most of the rules were NOT written. You had to make up quite a bit on the fly.
After this came 1st ed which I bought immediately. This edition did a good job of tying many needed rulings together for campaign consistency. At this point, the expansions and add-ons and magazines started coming out of the woodwork. My parents pulled me aside for a talking to in order to be sure I wasn't getting involved in satanism. More on that later.
Then came 2nd edition which was where AD&D reached perfection. Incorporating the best parts of the magazines and providing much-needed clarifications this set is the most comprehensive and fun while still maintaining enough open-endedness to cover all contingencies. Pure excellence. Miniatures were helpful, but not required at all.
<pause>
Comes now before ye the turdburglars at Wizards of the Coast. They buy out Gygax and decide to produce moneymaking monkey-filth flying the AD&D banner. The 3rd edition rulesets are made so that you will need to buy miniatures and maps and other garbage to play. All rules are re-written to use D20's. Can you frikkin imagine? D20's. For EVERYTHING. My dice are my BADGE, man. Then they (of course) have to reprint every rule book and manual out there (which by this time there are a lot) to reflect the 'shiny new stats' they've put on every creature and character. Bah. Might as well have been putting lipstick on a pig.
4th edition is even worse. Not only is it time to reprint everything, but they're stripping out all the individuality of D&D and making everything comparable to MMO charater classes. You don't play a warrior or a myrmadon or a barbarian anymore, you play a TANKER. HA! Tanker indeed. They can tank my arse.
<GAAH! rage... fading... red zone retreating>
Okay now, you asked something else?
Satan's game / Satanism connection
Oh yeah, thanks. Yeah, my parents talked to me about it and my friends' parents talked to them about it too. Then came this STUPID movie Mazes and Monsters trying to villify D&D. I swear before all the allmighty powers-that-be that I still, STILL haven't forgiven Tom Hanks for that and I probably never ever will. I hate you Tom Hanks. I hate you. <sigh> but I still watch your movies.
Jeez, now I've gone and written another mini-novella. STOP WRITING INTERESTING POSTS, tk5800! Hey, is that like TK421? TK421, why aren't you at your post?