I'm traveling to Switzerland and am wondering if I can enter the country with my UK Driver's License from London only? Basically, without my Passport. Also, is a UK-issued Driver's License considered an "official identity card from an EU/EFTA state?"
No, a driver's license is not an identity card, and cannot be used in lieu of a passport for EU/Schengen purposes.
Identity cards from EU countries that do issue them can be used instead of passports for purposes of internal travel in the EU/EEA, but the UK does not issue such cards to its citizens.
is a Driver's License issued from London considered an "official identity card from an EU/EFTA state?"
No. Such identity cards are proof of nationality, which is why they are useful for international travel (to some countries only). A driver's license is no proof of nationality; it does not even mention nationality.
As noted in the other answer, the UK does not issue such cards. Because of that, the only document a citizen of the UK can use to enter Switzerland is a passport.