TurboTax programs print out those 1040-ES vouchers if a user has an exceptional amount of tax liability. Since your tax year for 2018 was unusual, that explains the vouchers. They are printed as a suggestion, but can be ignored if you know that you don't need to make quarterly estimated tax payments in 2019. See the TurboTax FAQ below for more explanation.
https://ttlc.intuit.com/replies/3301872
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
