The Democrats definitely have their GOTV machine well-oiled and this year will be no exception despite the lack of an inspirational candidate.
Republicans pretty much have to fend for themselves in getting to the polling places and if they have nobody to vote for, many of them stay away. This year, Trump has a chance to bring out the millions who have stayed home in years past. Not sure if a huge GOTV effort is required here as conservatives are basically self-reliant and will get themselves to the polls - provided they feel they have a candidate to vote for.
Trump has done pretty well during the primaries with minimum infrastructure. More primary votes than any other GOP candidate before him.