Absolutely! I expanded mine gradually: added 2.5 megs RAM, 30 meg HD. It was pretty badass for 1989.
And upgrading your Kickstart from 1.2/1.3 to 2.04!
2.04 was such an enormous leap for the OS. I remember running 2.0 betas I downloaded from the local warez BBS, soft kicked or whatever it was called.
I rocked the IIe but wanted a IIgs like no other. I'd 'visit' it at our local 'Apple store' before the Apple store (It was Tokamac in Palo Alto if I remember correctly and I may not). I also collected an Amiga A500 and an Atari 1040st. Love. Those. Times.