I remember during the A500 days, the number 1 upgrade for most people I knew was the 512Meg expansion followed by the second disk drive. Everyone I knew with an Amiga had both (making a second disk drive extremely common from my perspective.
Also, as someone pointed out here, if you had a multidisk game that did not take advantage of the second disk drive, you generally got pretty annoyed with the programmers since swaping disks sucked.
You used to also feel pleased with your purchase with the the few games that noted you had extra ram etc and this was going to be used to enhance your experience.
