AllEars did a great series where they went to each park and one person had G+, one did standby only (with VQ for Remys). For Epcot, Genie+ doesn't really seem worth it unless you wanna skip the lines for Test Track and Soarin. Remy is VQ and if you don't get a boarding group you can try buying an ILL (which is a separate charge and doesn't require G+). Frozen offers ILL too. The rest of the rides all have waits times of 0-30 mins at various points in the day, and the free Genie app shows fairly accurate predicted ride times by the hour.

My plan for when I go in March is to buy an ILL for Frozen because my 5 year old niece might never speak to me again if we don't see Elsa, splurge on an ILL for Remy if we don't get a boarding group, and then just monitor the ride times for the rest. I'm more going to Epcot for food and drink this time though so I won't be disappointed if I don't hit every ride.