someone who believes in and lives according to routine
routineer in American English
(ˌruːtnˈɪər)
noun
a person who follows or adheres to routine or a routine
Word origin
[1870–75; routine + -eer]This word is first recorded in the period 1870–75. Other words that entered Englishat around the same time include: Mafia, Victorian, billing, giveaway, washout-eer is a noun-forming suffix occurring originally in loanwords from French (buccaneer; mutineer; pioneer) and productive in the formation of English nouns denoting persons who produce, handle,or are otherwise significantly associated with the referent of the base word (auctioneer; engineer; mountaineer; pamphleteer); now frequently pejorative (profiteer; racketeer)