Let me get some things clear. Please correct me if am wrong.
* After disabling HA/DRS, you manally migrated VM's to other host, from the host you wished to migrate.
* Did you exit out of maintenance mode after addition to new vCenter server.
Also can you check if the datastores are visible to the host you have added to new vCenter. Also check in the Virtual Machines tab of the host.
None of the VM/Templates will be deleted in the steps you followed.