Conventional symmetric cryptography is already very secure and easy, even in the face of future threats like quantum computers. (Asymmetric cryptography is the type of cryptography that cryptographers spend more time worrying about.) Not that you should do it yourself, but it's relatively easy to whip up a secure symmetric encryption scheme if you have a hash function that meets certain basic security properties (which even hash functions with known weaknesses like MD5 and SHA-1 still meet!). The only real hard part of symmetric cryptography is key management (making sure both ends of each conversation have the matching keys ready to use), and one time pads only make that harder by making the keys very large and stateful. I think there are few use-cases where the potentially increased security makes up for the more difficult key management (especially if it means you're also swearing off all asymmetric cryptography).