The WebTools Architecture Group is investigating splitting up WebTools components in a set of more consumable downloads. For example, you’ll be able to download the Facets framework or JavaScript Development Tools (JSDT) in a separate download, similar to how you can grab SWT standalone.
If you’re interested in this work or have any comments to give, check out the dedicated wiki entry (talk page) and newsgroup post.
I’m personally excited about seeing the SSE as a consumable download. Overall, I think this is great and hope the community provides feedback as they are the ones most affected by WTP doing this.