There's really no much extra effort needed for playing a 5er, you will get used in a matter of weeks. I fully adopten in less than a month and never looked back.
Two things has to be considered:
-Plucking technique for B string is a little different and you will have practice this for some time. But after so many years of not playing you will have to work on your technique anyway.
-you will have to mute the B string constantly
Other things to be considered:
5strings are heavier, more expensive and it can be difficult to find a good piece, even among more expensive basses. The best way is to play before buying.
B string can often be floppy but this can be caused by a bad plucking technique also - many bassist play 5 stringers but don't use B string equaly, in this cases poor plucking techique is often the main reason of "floppy B"