Yes, an Ebola infected goign on holiday is a worry but possibly more worrying is the fact the infection happened in the first place when you consider the precautions it jumped:

Health authorities on Monday said that health professionals treating Ebola patients in Spain always followed protocols outlined by the World Health Organisation. The nurse would have entered García Viejo's room just twice, said Alemany, and would have been wearing protective equipment on both occasions. "We don't know yet what failed," said Alemany. "We're investigating the mechanism of infection."