Following is some more info on this inyan.
Here are a few names, a sampling of some past gedolim who wore tefillin on chol hamoed IN ERETZ YISROEL (either betzinoh or otherwise) –
Moreinu HaRav Schach, Rav Isser Zalman Meltzer, Rav Michel Feinstein (eidem of the Brisker Rav), Pressburger Rav, and Rav Duschinsky, ??”?.
The ??”? ????? was in Eretz Yisroel. In his siddur Shaarei Shomayim, he has tefillin on chol hamoed.
Rav Moshe Feinstein ??”? writes in a teshuvoh that he knows of thousands of bnei Torah who put on tefillin on chol hamoed in Eretz Yisroel.
?????? ???”?, ??? ???? ????’ ????? ????”?, ???”? of Edah Charedis was heard also taking the position that someone whose minhog is to put on tefillin on chol hamoed cannot just suddenly drop it totally in Eretz Yisroel.
The above and previous post is based on what I heard about this inyan ??? ?? ?????? ??????? ????”?, ??? ?????? ??????? ??????? ??????.
I think there is an Oberlander minyan in Yerusholayim where they wear tefillin on Chol Hamoed as well, if I recall correctly.