Yes, probably. They were moved off those routes for two reasons. Immediately after 9/11, Continental cut flight schedules by 20%, grounded and retired its DC
10-30 fleet, which were operating Hawaii flights from
EWR and IAH. The 767-400's were needed to fill the
gap in the Hawaii and Guam markets where the DC10
used to operate.
The 764 was used on one of two daily EWR-CDG flights which was suspended after 9/11. The 764 also operated on the daylight EWR-LGW flight, which was downgraded to a 757 after 9/11 and now operates with a 762 but in the evening. It has replaced the VS flight that used to depart at 6:30pm.
The 764 was going to be used on the planned IAH-AMS route that begins in May but Continental will now use the 767-200 it is rumored.
The 764's are slated to be reintroduced in Atlantic service this summer, to Ireland (SNN and DUB from EWR). The airline is going to take delivery of 6-8 this year. EWR-FRA is going to be a 764 by summertime, replacing the 762. This route used to be a 777.
The 764's also operated from EWR to GRU pre 9/11, and now that flight goes out with a 762. The 764 also operated to MAD from EWR on occasion.