Yes, Flash was a great tool to create stuff. (I only used it in Macromedia times)
This however also lead to an abuse and for a while you had websites, fully in flash which broke so many things (deep linking/bookamrks, browser history, etc.) combined with unintuitive navigation and slowness due to animations ... plain overuse of an otherwise good technology.
Modern JavaScript frameworks have support for this and a result of Flash's experience is that browsers have specific APIs for that ... however: each new generation of developers has to learn :)
This however also lead to an abuse and for a while you had websites, fully in flash which broke so many things (deep linking/bookamrks, browser history, etc.) combined with unintuitive navigation and slowness due to animations ... plain overuse of an otherwise good technology.