https://www.youtube.com/watch?v=PIGxMENwq1k
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Required viewing for all Forwardians.
(I've lost track of how many times I've watched this.)
Some ships do have emergency antimatter generators per the TNG Technical Manual, but they're hideously energy-intensive to run--something like a 10:1 ratio of deuterium used for each unit of antimatter. They only make sense to run in the rare situation you absolutely need to warp to safety when you somehow have deuterium and a warp core but no antimatter.
But holodecks apparently have their own infinite power supply incompatible with any other Starfleet technology, so perhaps Voyager used the holodeck replicators to generate deuterium to run their antimatter generator whenever the Doctor isn't practicing his sermons.
Efficiency would be abysmal even by the normal standards of this process, but it beats walking back to the Alpha Quadrant.