Do nouns feel more intense and heavy than other words, like they dofor English speakers?

Or are capital letters so common that they don't feel heavy?

Not sure what you mean - are you asking about nouns, or proper nouns?

Nouns are capitalized in German, not other random words. But yes, both proper nouns and all other nouns feel heavier than other words.

Of course it's difficult to compare if they feel maybe a bit less heavy for me than for English speakers, but as a German capital letters do indeed feel heavy for me, as well.