CD's, DVD's, LP's and cassette tapes only as far as music goes...
The streaming I enjoy is limited to FloMax.
I also have R2R tapes and 78 RPM records that I cannot play on my current setup.
I do not trust a non physical music or otherwise library due to all the digital failures that I have experienced since 1997, or so, and they just keep coming on strong.
This said, if I did not already own a physical media library containing almost everything of interest to my wife and myself streaming would definitely spark my interest as it would be considerably less expensive, and require considerably less effort than obtaining hard media of older selections of interest.
Instant gratification (for me) is currently directed towards Internet searches and Cable TV watching.
I prefer to listen to music in the same manner that I cook, bathe and otherwise live life - with a more hands on approach - doing so as long as I can (I also dislike change as I'm a Capricorn dambit)
DeKay