I'm planing on backpacking across Europe next year and I hate being the dipshit who only speaks one langue. I already have a small amount of german and spanish so those are the only two I'm interested in. I get the impression that outside of Spain spanish isn't spoken much but I do plan on traveling south america at some point too so spanish is going to be needed eventually.
The only reason to learn German is if you intend to emigrate there. English and knowing key phrases in the country you’re in is sufficient in Western Europe.