I own a Glock 19 too. Funny thing is: I've never carried it. Not once. I carry my S&W 6906. It's a MUCH better carry gun; for me anyways.
Glocks are decent guns. They are VERY reliable... well, many of the 4th gen guns aren't, but before that, most just run really well. Mine sure does.
As you said: they are REALLY easy to find accessories for. REALLY easy. Every holster company in the world, well, practically, makes a holster for the Glock 19.
You used to be able to buy magazines for them for just $20. Now, magazines are hard to find, but I did see some selling for $25.... but they were out of stock. Glock will fill the back orders from distributors and resellers soon, I'm sure.
And, they ARE easy to work on. Amazingly easy. Three pins, and everything in the frame comes out. Aftermarket parts to decrease and smooth out the trigger pull abound.
The main reason that Glocks are so popular with the LE community is simple: they are CHEAP. Glock sells them in contracts to LE for between $300 and $400. Big contracts get them REALLY cheap. Nobody else can come close to Glock's prices to LE and the military.
All that being said, I think Glocks are *****. The grip angle can only charitably called 'learning challenged'.
Carrying a Glock with a round in the chamber is LESS SAFE than carrying a 1911 cocked and UNLOCKED. Because, the 1911 has a grip safety. Everytime you read aout somebody shooting themselves, it's ALWAYS a Glock. Always.
Glocks SHOULD be safe to carry, but, people make mistakes. Everybody makes mistakes. They use poor judgement. Some are just idiots. Add this all up, and people shoot themselves, and sometimes, innocent bystanders.
This is the reason why I carry a S&W 6906, and NOT my Glock Model 19. I've NEVER managed to have a ND with a S&W pistol. I've never managed it with a Glock, either, but it's just waiting to happen. Adrenaline can make you stupid, and careless.
I don't want to shot myself, or anyone else, by accident.
I've kept my Gen 2 G19 for all the reasons listed above, but I rarely shoot it. It's just not nearly as much fun as, well, just about ANY OTHER firearm. It's WAY too much work, getting a good group out of a Glock, when it's SO EASY from well, just about any other (non polymer) gun.