Wheres the old Stand off between ghouls and humans for the water fridge?

Where's the Alien Ship explosion with the dead bodies?

Where's the Brahmin Stampede?

Where's the Vertibird Enclave Dropzones?

Where's the Dude running from the slavers?

Those were some of the best times I ever had with FO3, just WTF was that moments that made wandering around fun!

I think so far I saw a random spawn of Geckos so far... I'm not sure if they were just respawned ones I had killed earlier...

obsidian wasnt given enuf time to add i guess fancy things more or less vegas is a bare bones game without unecessary bull **** /depends on opinion

Sadly, no.
It's good we don't run into stuff every 30 meters but exploring gets really predictable because of the fixed spawn locations.