The benefit of these plugins are that the resulting image is rendered directly from text. This means if an edit is needed, it can be done as quickly as typing the changes. This is a lot faster and more efficient than using a vector based drawing tool to manually modify the image to make some space and then carefully draw in lines and text to represent the new sequences added.
A latest plugin is ZenUML sequence diagram- https://marketplace.atlassian.com/plugins/com.zenuml.confluence-addon/cloud/overview . Similar to PlantUML, the image is rendered from TEXT. The advantage is that it is rendered directly IN BROWSER. So there is no network delay involved. It is not just faster, it is instant :)
You can try it out at https://www.zenuml.com before installing the plugin.
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