First of all, the nouns in German really hardly change based on case, with a few exceptions (and then with the general exception of the -n of the dative plural). Second of all, the adjective changes are really minimal and mimic the articles, and you've only got four cases. Latin has five primary cases, Russian six.

Not only that, but given that pronouns decline in virtually all Indo-European languages (I would just say all, but there may be an exception out there), you're already exposed to cases as is!

I would also urge you to try it because even if it doesn't come intuitively to you at first, a bit of practice will clear that up and you'll be reading it with no trouble fairly quickly.