CLN: simplify get_values usage in groupby (#32523)

Author: jbrockmendel

pandas/core/groupby/generic.py

@@ -49,7 +49,7 @@
     is_scalar,
     needs_i8_conversion,
 )
-from pandas.core.dtypes.missing import _isna_ndarraylike, isna, notna
+from pandas.core.dtypes.missing import isna, notna
 
 from pandas.core.aggregation import (
     is_multi_agg_with_relabel,
@@ -1772,10 +1772,8 @@ def count(self):
         ids, _, ngroups = self.grouper.group_info
         mask = ids != -1
 
-        vals = (
-            (mask & ~_isna_ndarraylike(np.atleast_2d(blk.get_values())))
-            for blk in data.blocks
-        )
+        # TODO(2DEA): reshape would not be necessary with 2D EAs
+        vals = ((mask & ~isna(blk.values).reshape(blk.shape)) for blk in data.blocks)
         locs = (blk.mgr_locs for blk in data.blocks)
 
         counted = (