Wow that's a long time in the lower CC range. what was the highest CC bike you have owned?
While I've ridden motorcycles with larger displacements 1200cc, like my current Sportster, is the largest displacement I've ever own. Then again I'm really a "Sportster" rider as it's my favorite overall motorcycle for several reasons.
Remember that I grew up in the 1960's where a 750cc motorcycle was a large displacement motorcycle. AMA racing was limited to 650cc and most of the popular motorcycle brands such as Triumph and BSA didn't even offer anything larger than 650cc. The original Sportster introduced in 1957 was only 883cc and it was considered to be "very large" displacement. The Honda CB750 introduced in 1969 was considered to be a large displacement motorcycle. Think about this. The WW II Harley WBA that was the foundation for the "style" of post WW II bobbers was a 45 cid, 740cc, flathead engine with only about 27 bhp (less than the Street 500).
Since then we've had "displacement inflation" that, in some cases, has reached the absurd. Who really needs a 145cid S&S engine and what the heck for? It's sort of like putting a Rolls Royce Merlin aircraft engine or a full blown Chrysler Hemi in a street rod. It's more about "freak show" as opposed to being anything practical.
In reality a 500cc and 750cc motorcycle is all anyone really needs for practical riding purposes. They'll both go faster than the speed limit and both have excellent engine performance characteristics. The rest depends on the configuration of the motorcycle. It can be a touring motorcycle, a cafe-racer good for local riding, a dual-sport, a dirt bike or even a custom chopper show bike like I'm building without any need for a larger displacement engine from a pragmatic standpoint. The 500cc/750cc engine is just fine and provides all of the power necessary for any practical use. The practical use is based upon how the motorcycle is configured and is not really dependent upon the engine size.