Did the ancient Greeks and Romans had an entirely different view of small penises than the modern world today?

Yes. The Greeks thought long danglers were gross and unattractive. This can be seen in many paintings on pottery and mosaics. Probably you could also tell from statutes but an anti-sex Greek cult broke the penises off many statues. Anyway, from the surviving art, you can see quite clearly that large penises only appear on evil and out-of-control characters, while nice men are shown with modest endowments even when erect. Generally Romans idealized Greek art and fashion and absorbed the same attitude from the Greeks.

Yes. If you doubt it, go look at some Greek and Roman art; gods, heroes and divine emperors are always - literally always - provided with small neat equipment. Only the satyrs, slaves and comic villains have big ones.

Yes. They thought large penises vulgar.

They considered large penises vulgar because of practical reasons: they practiced anal sex a lot and in situation of large dangler in use, there is possibility of injuries.

"Men for pleasure, women for birth" Greek sentence.

Yes, particularly in terms of art.

Lars answer gives you the reasons.

Yes, eye level. Besides, the men in Greece and Rome were all as bisexual as their gods, so they didn't want to get hurt.

Yep, they'd have laughed at you and your little friend behind your back instead of posting it online.

At least they had their whole penis. Baby boys get half of their penis skin amputated.

How should we know,

It is therefore wholly incompatible with Christian conduct to use your mouth, lips and tongue to speak forth filthy or obscene talk.

Something to ponder over.

Proverbs 17:28

Even a fool is thought wise if he or her keeps silent, and discerning if he holds his or her tongue.

They were modeling after yours