Guille, all,

When in doubt, look at Dolphin.  It has the best IDE I have ever used.  That's all the more true of 5.x.

In Pharo, the way one gets to implementors and senders could be better.  I am both amazed by the system's ability to find a method name in selected text, and disappointed by that fact that I have to select text vs. just getting a list of methods from which to choose.  Choose senders or implementors in Dolphin (context menu in the method lists), and it provides a list (the selected method in bold at the top), and the locally sent/referenced methods below that.

Dolphin also has a command that uses a text prompter to enter the selector, and it allows wildcards.  Pharo's MessageNames/Finder tools do at least as much as Dolphin's version of the command.  My only gripe with Pharo's version of the search is that I sometimes get too many matches; regex will probably fix it if I would just work at it<g>.  Overall, Pharo is on course to do this really well.

Regardless of how one obtains a method list, Dolphin does a (much) better job of presenting the results, mostly by providing sortable multi-column lists.  Looking for #add: over the entire system can be painful, but #add: defined or used in a particular package or class can be very manageable.  Dolphin makes that easy to see by sorting on the appropriate package/class/selector column.

Bill